Fish Groups
Most of the questions people arrive with are about a group rather than a species. Which pufferfish are actually freshwater. Whether gold and opaline gouramis are different fish. How big the small snakeheads really get.
A species profile cannot answer those, because answering them means putting a dozen species side by side. These pages do that: one group, every species in it that we cover, and the comparison that decides which one you want.
The figures in each comparison come from the individual profiles, so the table and the page it links to cannot disagree.
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Gourami Species: Which Ones Are Actually Different Fish
Gold, blue and opaline gouramis are one species under three names. A guide to which gouramis are genuinely distinct, how big each gets, and which ones fight.
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Pufferfish Species: Freshwater, Brackish and Marine
Most pufferfish sold as freshwater are not. Which species are genuinely freshwater, how big each gets, and why every puffer needs hard-shelled food.
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Rainbowfish Species: Why They Look Dull in the Shop
Rainbowfish are sold as juveniles before their colour develops, which is why they look grey in the shop tank. Which species to pick, and what they need to colour up.
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Snakeheads in the Aquarium: Species, Sizes and the Law
Snakeheads are air-breathing predators, several are illegal to own, and the small ones are not small. Which species suit a home tank, and what to check before you buy one.
