Aquarium Keeping Honor

Nature Study

Requirements

1. Have the Fish Honor.

   Answer: You need to have completed the Fish Honor before Aquarium Keeping. This ensures that you already know the anatomy, biology, classification, and habitats of various fish — a mandatory foundation for understanding the specific needs of each species in the aquarium, choosing compatible fish, and properly caring for the artificial environment recreated at home. — Especialidade de Peixes cobre fundamentos: nadadeiras, brânquias, escamas, reprodução, alimentação, classificação. Sem isso, aquarismo vira só hobby visual sem entendimento. Saber sobre peixes é vital — algumas espécies são predadoras, outras pacíficas; algumas vivem em água doce ou salgada; cada uma tem temperatura, pH e tamanho de aquário ideal. Combinação errada mata os peixes.

2. What is aquarism or aquarium keeping?

   Answer: Aquarismo (ou aquariofilia) é o hobby/prática de criar e manter peixes ornamentais e plantas aquáticas em aquários domésticos, recriando ambientes aquáticos artificialmente controlados. Envolve cuidados com qualidade da água (pH, temperatura, oxigenação, filtragem), alimentação adequada, escolha de espécies compatíveis e estética visual do aquário ('aquascaping'). — Aquarium keeping is a millennia-old hobby — the Egyptians already kept fish in stone vessels. In modern times it grew with the technology of filters, heaters, and LED lighting. It is subdivided into: freshwater (simpler and cheaper), saltwater (more complex and expensive, with corals), and planted (with live plants and advanced aesthetic techniques). Brazil has a strong market for ornamental fish.

3. Present the history of aquarium keeping, the first peoples to practice it, the development of techniques, historical evidence, etc.

   Answer: History of aquarium keeping: 1) Antiquity — the Sumerians and, above all, the Egyptians kept fish in tanks and stone vessels about 4,000 years ago, some considered sacred; the Romans raised fish in private pools and tanks (piscinae). 2) China — around 1,000 BC the Chinese domesticated the goldfish (kinguio) and developed selective breeding, producing ornamental varieties; porcelain vessels were used to display them. 3) Modern Age — in the 19th century, in Europe (especially England), the first glass aquariums appeared; the term 'aquarium' became popular after the Great Exhibition of London (1851) and the book by Philip Henry Gosse. 4) 20th century — the invention of filters, aeration, heaters, and artificial lighting transformed aquarium keeping into an accessible hobby, giving rise to the modern planted aquarium and, later, marine reef keeping. Historical evidence includes Egyptian frescoes, Roman records, and Chinese ceramics with ornamental fish. — Aquarium keeping has a millennia-old evolution. The Chinese were the most influential — they created the goldfish (Carassius auratus) through artificial selection, now spread worldwide. In London in 1853, William Alford Lloyd created the first public aquarium. The 20th century brought mechanical/biological filters, fluorescent lamps, and controlled CO2. Today reef aquariums (saltwater) achieve impressive realism of natural coral.

4. Explain what each of the following is, how it works, and what it is used for:
   • Thermostat
   • Gravel
   • Substrate
   • Vacation feeder
   • Biological media plate
   • Bio Ball
   • Collection net
   • Fluidized filter
   • External filter
   • UV filter
   • Ozonizers
   • Calcium reactor
   • Skimmer
   • Bacterial boosters ("biology accelerators")
   • Automatic feeder

   Answer: 1) Thermostat: a device that measures the water temperature and automatically turns the heater on/off, keeping the temperature ideal and stable for the fish. 2) Gravel: a material of small stones that covers the bottom of the aquarium; it serves as decoration, anchors plant roots, and houses colonies of beneficial bacteria. 3) Substrate: a layer of material at the bottom of the aquarium (sand, gravel, or fertile soil); it supports the plants, hosts nitrogen-cycle bacteria, and helps the biology of the tank. 4) Vacation food: a slow-dissolving block of food that releases nourishment little by little over several days, used to feed the fish when the aquarist is away. 5) Undergravel filter (biological plate): a bottom filter placed under the substrate; water is drawn through it and the bacteria living there perform biological filtration, transforming toxic waste. 6) Bio Ball: a hollow plastic ball with a large surface area that serves as a home for beneficial bacteria; it is used as biological media in filters to purify the water. 7) Collecting net: a small net with a handle used to safely capture and transfer fish without injuring them, during maintenance or when moving aquariums. 8) Fluidized filter: a filter in which the media (sand or beads) is kept in suspension by the water flow, creating a huge area for bacteria and providing strong biological filtration. 9) External filter (canister): a closed filter installed outside the aquarium, through which water circulates passing through various media (mechanical, chemical, and biological); very efficient for larger aquariums. 10) UV filter: a device that passes water under ultraviolet light, sterilizing it by killing algae, bacteria, and parasites in suspension, leaving the water cleaner and clearer. 11) Ozonizers: equipment that injects ozone into the water to oxidize organic matter, eliminate microorganisms, and improve the clarity and quality of the water. 12) Calcium reactor: equipment used in marine coral aquariums that dissolves calcareous material with CO2, replenishing calcium and maintaining the alkalinity needed by corals. 13) Skimmer: also called a protein skimmer, it separates and removes proteins and organic waste from the water by means of bubbles; used mainly in marine aquariums. 14) Bacterial boosters (biology accelerators): products with live bacteria or nutrients that accelerate the formation of beneficial colonies, helping to establish the nitrogen cycle in new aquariums. 15) Automatic feeder: a programmable device that releases food at set times, ensuring the feeding of the fish even when the aquarist is away. — Esses equipamentos são essenciais para aquário moderno. Termostato evita choque térmico. Substrato/cascalho colonizam bactérias nitrificantes (Nitrosomonas, Nitrobacter) que decompõem amônia. Placa biológica força água através do substrato (filtragem natural). Filtro UV controla algas e patógenos. Skimmer remove substâncias orgânicas dissolvidas. Alimentador útil para férias.

5. Cite some advantages and disadvantages of a saltwater aquarium compared to a freshwater one.

   Answer: Vantagens da salgada: cores espetaculares (peixes tropicais, corais), fauna mais variada, paisagem única (recifes), grande apelo visual. Desvantagens: custo muito maior, manutenção complexa (sal, salinidade, parâmetros químicos rígidos), filtragem sofisticada exigida, peixes mais frágeis e caros, risco maior de desequilíbrio que mata todos os habitantes do aquário. — A marine aquarium requires advanced knowledge and an investment of R$5,000-50,000+. Salinity must be monitored with a refractometer. Calcium, magnesium, and alkalinity must be balanced for corals. The skimmer and filtration are more elaborate. Freshwater, on the other hand, is more accessible (R$300-2,000) and is more forgiving of beginner mistakes. Brazil has a growing marine aquarium market but it is still a restricted niche.

6. Identify, live or by photo, 10 saltwater ornamental fish and 15 freshwater ornamental fish commonly used in aquariums.

   Answer: Salgada (10): (1) peixe-palhaço; (2) peixe-cirurgião; (3) donzela; (4) peixe-anjo; (5) blênio; (6) góbio; (7) dragonet; (8) peixe-borboleta; (9) hawkfish; (10) baiacu. Doce (15): (1) kinguio; (2) betta; (3) neon; (4) kuhli; (5) platy; (6) molly; (7) guppy; (8) espada; (9) paulistinha; (10) oscar; (11) acará; (12) cascudo; (13) barbo-tigre; (14) ramirezi; (15) killifish. — Knowing these species is essential for choosing compatible fish. Clownfish (Nemo!) are famous marine fish. Betta, goldfish, neon tetra, and guppy are classic beginner freshwater fish. The surgeonfish is large and requires a bigger aquarium. The plecostomus cleans algae. Each species has its own temperature, pH, diet, and behavior (peaceful/aggressive). The wrong mix leads to predation or fatal stress.

7. Know 10 freshwater aquatic plants commonly used in aquariums. Identify them by photo or live.

   Answer: 1) Anubias (folhas largas, fixa em pedra). 2) Vallisnéria (alta, fitas longas). 3) Elódea (clássica, cresce rápido). 4) Cabomba (folhas finas em leque). 5) Musgo de Java (cobre superfícies). 6) Hygrophila polysperma (alta, fácil). 7) Rotala (vermelha, exigente). 8) Glossostigma (carpete baixo). 9) Cryptocoryne (folhas largas baixas). 10) Echinodorus (planta âncora central). — Plantas aquáticas oxigenam a água, absorvem nitratos, oferecem abrigo e estética. Categorias: âncora central (Echinodorus), fundo (Cabomba, Vallisnéria), meio (Hygrophila), foreground/carpete (Glossostigma, Anubias). Algumas precisam de CO2 e luz forte (Rotala vermelha); outras são fáceis (Anubias, musgo). Cada planta tem requisitos próprios que devem combinar com os peixes e iluminação do aquário.

8. Identify, live or by photos, 5 corals used in marine aquariums.

   Answer: 1) Coral-cogumelo (mushroom — fácil para iniciantes). 2) Zoanthus (colorido, baixa luz). 3) Euphyllia (martelo, polipos longos). 4) Acropora (SPS — Small Polyp Stony, alta luz e CO2). 5) Galaxea (estrela do mar coral, intermediário). Cada coral tem necessidades de luz, fluxo e parâmetros químicos específicos para sobrevivência em aquário marinho. — Corals are classified into SPS (Small Polyp Stony — demanding), LPS (Large Polyp Stony — moderate), and soft (Soft — easy). Mushroom and zoanthus are soft, ideal for beginners. Acropora is SPS, requiring strong light (T5 or reef LED) and specific flow. Keeping corals is the ultimate challenge of marine aquarium keeping — it requires calcium (380-450 ppm), alkalinity (8-12 dKH), magnesium (1,250-1,350 ppm).

9. List and identify, live or by photos, 5 common animals in marine aquariums. (Do not include fish or corals in the list).

   Answer: 1) Cleaner shrimp (Lysmata, cleans parasites off fish). 2) Blue starfish (decorative). 3) Turbo snail (cleans algae). 4) Anemone (Heteractis, hosts the clownfish). 5) Hermit crab (cleans food scraps). Each one fulfills a specific ecological function in the marine aquarium — cleaning, decoration, symbiosis with fish — properly and always during the study. — Marine life in an aquarium goes far beyond fish. The CUC (Cleanup Crew) includes shrimp, snails, and crabs that keep the ecosystem healthy. Anemones host clownfish in a famous symbiosis (the movie Nemo). Starfish and urchins decorate. Each specimen is expensive (R$30-300+). Compatibility among them and with the fish is critical to avoid predation or competition for territory.

10. List and identify, live or by photos, 5 common animals in freshwater aquariums. (Do not include fish in the list).

    Answer: 1) Cherry shrimp (Neocaridina davidi, red colored). 2) Apple snail (Pomacea, cleans algae). 3) Trumpet snail (Melanoides, digs the substrate). 4) Blue crayfish (Cherax, striking). 5) Vampire crab (Geosesarma, semi-aquatic). Each one fulfills a function in the aquarium — decoration, cleaning, algae control, substrate — properly and always during the study. — Freshwater aquariums have a great variety of invertebrates. Cherry shrimp are popular for their appearance and because they breed easily. The apple snail eats algae but breeds a lot (population control). The trumpet snail digs the substrate, preventing anaerobic pockets. Crayfish and crabs need their own aquarium (predators). Compatibility with fish must be checked — some fish eat shrimp.

11. List 5 different water tests, explain the importance of using them, and demonstrate the use of at least one of them.

    Answer: 1) pH (acidez/alcalinidade, ideal 6,5-7,5 doce, 8,1-8,4 marinho). 2) Amônia (NH3, deve ser zero — letal). 3) Nitrito (NO2, intermediário do ciclo, deve ser zero). 4) Nitrato (NO3, produto final, manter <40 ppm). 5) GH/KH (dureza). Importância: garantir saúde dos peixes, prevenir morte súbita, monitorar ciclo do nitrogênio, ajustar antes de problemas. — The 5 essential tests protect the fish. Nitrogen cycle: ammonia (toxic) → nitrite (toxic) → nitrate (less toxic). If ammonia appears, there is a problem. Wrong pH stresses fish (some need acidic, others basic). Hardness affects osmosis. Testing once a week is the basic minimum; after a change or new fish, test 2-3 times in the week. A colorimetric kit costs R$50-150 and lasts 1-2 years.

12. Complete the following activities:
    • Set up an aquarium of at least 20 liters, with a balanced quantity of plants and fish, and maintain it for at least 6 months.
    • During setup, observe the following:
    • Over a period of at least 3 months, take note of the effects on the fish and on the aquarium in general of the following conditions:

    Answer: Você compra aquário 20+ L, prepara substrato e plantas, enche com água tratada (sem cloro), instala filtro e termostato, faz ciclagem inicial (2-4 semanas sem peixes), adiciona peixes gradualmente. Mantenha por 6 meses anotando: temperatura semanal, pH/amônia/nitrito mensal, comportamento dos peixes, crescimento das plantas e quaisquer mudanças notáveis. — This is the main requirement of the Honor — it demands real commitment. Cycling (2-4 weeks) lets bacteria colonize before the fish. Recording everything trains scientific observation. Over 6 months, seasonal variations appear (algae, diseases, breeding). Partial water changes (20%/week). A detailed log is the foundation of professional aquarium keeping — it allows you to learn from your own successes and failures.