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SPECIES GUIDEFish

Setting up your first aquarium: get the water ready before the fish arriveA new aquarium isn't ready for fish on the day you fill it. The nitrogen cycle, fishless cycling, the filter, the heater, water conditioner, where to put the tank and adding fish a few at a time.10 min read · Last checked: October 24, 2026Read →

SPECIES GUIDEFish

Why can't a goldfish live in a bowl? Size, lifespan and real needsA goldfish in a bowl is a familiar sight, but it isn't a suitable home for the fish. Goldfish grow much bigger than people think, live for many years and produce a lot of waste; they need a large, filtered aquarium.7 min read · Last checked: October 24, 2026Read →

SPECIES GUIDEFish

Betta fish care: the small jar myth and what they really needThe Siamese fighting fish (betta) is a tropical fish that loves warm water. A heater, a filter, a tank of at least 20 liters, a gentle current, bubble nests and why males must never be kept together.9 min read · Last checked: October 24, 2026Read →

Aquarium water changes: how often, how much and how?Clear water isn't always clean water. Regular partial water changes, siphoning the gravel, dechlorinating the new water, matching the temperature and cleaning the filter without killing the beneficial bacteria.8 min read · Last checked: October 24, 2026Read →

Adding new fish to your aquarium: a safe move from bag to tankBringing new fish home and tipping the bag into the tank is one of the most common mistakes. Choosing healthy fish, compatible species, quarantine, acclimatizing with the bag and adding fish a few at a time.8 min read · Last checked: October 24, 2026Read →

Overfeeding fish: how a loving pinch of food spoils the waterFish look like they're begging for food every time you come near, but overfeeding is one of the most common problems in aquariums. How much and how often to feed, how to remove uneaten food, and what to do before you go on vacation.8 min read · Last checked: October 24, 2026Read →

Your aquarium while you're on vacation: keeping fish safe while you're awayYou can't take the fish with you, but you can't leave the aquarium to fend for itself either. Someone to check every day, written instructions, meals prepared in advance, automatic feeders, vacation blocks, a lighting routine and summer heat.8 min read · Last checked: October 24, 2026Read →

SPECIES GUIDEInvertebratesFish

A shrimp aquarium: mature water, patience and a copper-free home for cherry shrimpCherry shrimp (Neocaridina davidi) are small, colorful and lively, but sensitive to their water. Why do a mature aquarium, slow acclimation, regular partial water changes and keeping copper away matter so much?8 min read · Last checked: October 24, 2026Read →

Aquarium temperature: heaters, thermometers and protecting fish from sudden changesFor fish, a steady temperature matters as much as the right one. Tropical and coldwater fish, heaters with a thermostat, checking the thermometer every day, and avoiding sudden changes during water changes and when the seasons turn.6 min read · Last checked: October 26, 2026Read →

SPECIES GUIDEFish

Guppy care: a small, colorful fish that breeds fastGuppies are peaceful, easy-to-keep tropical fish; but they need a heater, a filter and a plan for how quickly they breed. Tank size, the male-to-female ratio, suitable tankmates, food and fry.7 min read · Last checked: October 26, 2026Read →

Live plants in the aquarium: what do they do, and how do you start?Live plants do more than make a tank look good; they use some of the waste and give shy fish a place to hide. Lighting hours, substrate, planting step by step, CO2 and fertilizer, trimming, and buying plants from a safe source.7 min read · Last checked: October 26, 2026Read →

Why do shoaling fish live in groups? How many neon tetras, rasboras and barbs do you need?Tetras, rasboras, danios and barbs are shoaling fish; kept alone or in twos and threes, they become stressed. What a shoal gives a fish, how many is enough, why not every fish wants a shoal, and how to set up a tank for one.7 min read · Last checked: October 26, 2026Read →

SPECIES GUIDEFish

Goldfish and koi in a garden pond: depth, winter, predators and child safetyA garden pond can be a great home for fish, as long as it's deep enough, filtered and mature. Which fish are suitable, where to put the pond, ice and feeding in winter, keeping herons away, and safety for children.8 min read · Last checked: October 26, 2026Read →

How does an aquarium filter work? Three types of filtration, filter types and a maintenance scheduleA filter is both your aquarium's vacuum cleaner and the home of its beneficial bacteria. What mechanical, biological and chemical filtration mean, what each type of filter is for, why it should never be switched off, and what to check when.8 min read · Last checked: October 28, 2026Read →

Algae in the aquarium: why does it grow, and are algae eaters the answer?That green film on the glass is usually a sign of something: too much light, sunlight or nutrients building up in the water. What feeds algae, the steps to restore the balance, and what algae-eating fish really need.8 min read · Last checked: October 28, 2026Read →

SPECIES GUIDEFish

Which fish can live together? Choosing compatible fish for a community aquariumFish that sit side by side at the store may not get along in the same tank at home. Adult size, mouth size, temperature and water hardness, temperament: four questions to ask when planning a community aquarium, with examples from OATA's species guides.8 min read · Last checked: October 28, 2026Read →

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Articles are for general information and are not a substitute for diagnosis or treatment. Ask your vet about any decision for your pet.