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Healthy Fish Begin With a Stable Aquarium

Keeping fish healthy involves much more than choosing a colourful species and filling a tank with water. Aquarium stability depends on adequate volume, filtration, biological cycling, oxygen exchange, suitable temperature, compatible tank mates and careful feeding. Our fish directory covers beginner-familiar freshwater species such as guppies, mollies, bettas, goldfish, neon tetras and angelfish. Individual species have different adult sizes, social needs, swimming behaviour and water preferences, so research those requirements before purchasing fish or combining species in one aquarium.

Test water regularly and understand the importance of ammonia, nitrite, nitrate, pH and temperature rather than relying on water clarity alone. A newly set-up aquarium needs time to establish its biological filter; adding many fish too quickly can create dangerous water-quality problems. Avoid sudden temperature or chemistry changes, overfeeding and unnecessary complete water replacement. Use a dechlorinator when required for treated tap water, and match maintenance to the aquarium’s stocking and filtration. Local water conditions can vary between cities and local water supplies and even neighbourhoods, so test the actual water source. Our fish profiles and aquarium articles explain essential terms in accessible language and help readers plan a stable habitat before bringing fish home.