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Cherry barbs have spent the last few years in a genuine scientific tug-of-war over which genus they even belong to, something almost nobody buying one at a shop would ever guess. In practice, this is one of the easiest, most forgiving barbs in the hobby, prized for a red coloration that intensifies dramatically in breeding…
Freshwater angelfish sit in an odd spot in the hobby: hardy enough for a beginner tank, yet closely related to a genuine blackwater specialist that gets confused with it constantly, sometimes deliberately. In practice, Pterophyllum scalare is the angelfish species behind the overwhelming majority of what’s sold as “angelfish” worldwide, and understanding where it ends…
Symphysodon discus is the fish that gave an entire genus its name, and it’s also the least commonly kept of the three species that name actually covers. In practice, nearly everything sold as “discus” in the aquarium trade, from marlboro reds to blue diamonds to pigeon bloods, descends from a different, hardier relative rather than…
Goldfish are probably the single most misunderstood pet fish on the planet, and the fishbowl is exhibit A. In practice, this species was one of the first fish humans ever domesticated, bred for color in imperial China over a thousand years ago, and it deserves genuinely serious care rather than the bowl-and-forget treatment it usually…
Molly fish complete a lineup that most aquarists build without ever planning to: platy, swordtail, molly, three closely related livebearers that all show up in the same beginner shopping cart. In practice, mollies bring something the other two don’t quite match: a genuine tolerance for brackish and even marine water, real individuality in temperament, and…
Swordtail fish get their name from a feature only the males have: an elongated lower tail lobe that can stretch out a third of the body’s total length. In practice, this livebearer shares almost everything else with the platy, its closest relative, right down to overlapping color varieties and near-identical water needs. This guide covers…