3,895 answers about fish & aquatics
A healthy aquarium is a balanced one — water chemistry, filtration, stocking and feeding all work together, and most fish problems start with the water. This page gathers the fish and aquatics library of KinsLe Answers in one place, organized by topic for freshwater and saltwater keepers alike. Every answer is original, written by KinsLe, and tied to a real KinsLe feature.
562 answers in Choosing & Adopting — page 5 of 24
A fully grown licorice gourami is tiny, reaching only about one to one and a half inches long, and many adults stay closer to the smaller end of that range. Its size is only half the story, because this delicate blackwater fish needs soft, acidic, heavily planted water far more than it needs space. Give your licorice…
A fully grown hillstream loach reaches roughly two and a half to three inches long, but its flattened, wide-finned body covers far more rock surface than that length suggests. Plan around the grazing area it needs as much as the inches, because an adult hillstream loach spends its day working over stones and glass for…
A fully grown fork-tail rainbowfish reaches about two inches long, with males showing the forked tail and brighter fin edges that give the species its name. That small adult size makes a school, rather than a single fish, the right way to plan a tank, because fork-tails look and behave best in a lively group near the…
A fully grown discus reaches about six to eight inches across, and because the body is a tall, round disc, that diameter makes it a large and imposing fish. Height matters as much as length, so discus need a deep tank with vertical room, not just a long one. They grow slowly in warm, clean water and a school of adults…
A fully grown bumblebee goby stays tiny, reaching only about one to one and a half inches long, which makes it a true nano fish. Its small size hides a bold, territorial character, so each goby still needs its own cave or shell to claim even in a small tank. Bumblebee gobies also do best in hard, slightly brackish…
A fully grown boesemani rainbowfish reaches about four inches long, with males growing larger and much deeper-bodied than females, who usually stay closer to three inches. That deep, tall shape makes an adult male look bigger than the tape measure suggests, and a school of them needs a long tank rather than a small…
Threadfin rainbowfish are the most vulnerable fish in most homes, so they are good with other pets only behind a secure lid and beside very calm tankmates. A cat poses a real threat if it can reach the water, and inside the tank any fin-nipper, fast feeder, or fish much larger than these two-inch threadfins can damage…
Threadfin rainbowfish are good with older, gentle children who enjoy watching delicate fish display, but they are a fragile choice for young or boisterous households because their long fins tear easily and they stress at tapping and sudden movement. An adult should watch that they actually eat at every feed, while a…
Threadfin rainbowfish are among the hardest rainbowfish for a first pet, despite their small size and peaceful nature. Males carry long, fragile fin extensions, the fish feed slowly on tiny foods, and they fade quickly in a new or unstable tank or beside faster tankmates. A beginner who first matures the aquarium,…
Fork-tail rainbowfish are safe with other household pets only behind a secure lid, because at about two inches they look exactly like prey to a cat and hold no interest for a dog beyond movement at the glass. Inside the tank they are the vulnerable ones: larger fish may eat them and boisterous tankmates outcompete…
Fork-tail rainbowfish are good with children who enjoy watching tiny, busy fish, because a school flashes blue eyes and yellow tails all day and breeds readily enough to spark real curiosity. They are far too small and delicate to be handled, and sudden tapping or shadows send them darting, so an adult should manage…
Fork-tail rainbowfish are easy in temperament but delicate in practice, so they suit a first-time keeper who starts with a mature, stable tank rather than a brand-new setup. They stay small, school peacefully, and eat tiny foods, yet they react badly to swinging water conditions that hardier starter fish shrug off.…
Boesemani rainbowfish live safely alongside most other household pets because the aquarium separates them, and they are peaceful with suitable tankmates of similar size. The real risks are a cat patting at the glass or fishing from an open top, and a dog jolting the stand, so a secure lid and sturdy placement matter…
Boesemani rainbowfish are good with children as watch-together pets, because they are active, colourful, and visible all day in a school. They are not pets a child can hold, and tapping, sudden shadows, or hands in the water will frighten them, so an adult should own feeding amounts and all water changes. Set the tank…
Boesemani rainbowfish are moderately easy once their tank is properly set up, but they are not the smallest or cheapest starter fish. They school, grow fairly large, and need a long tank with warm, stable water and a group of their own kind from the start. A beginner willing to cycle the aquarium first and keep up…
Amano shrimp are peaceful toward every other animal in the home, but whether they are safe depends entirely on what those other pets are. In the tank they live happily alongside small, gentle fish and snails, yet any fish large or predatory enough to hunt shrimp will eventually catch one, especially just after a molt.…
Yes, amano shrimp work well with children as long as everyone understands they are a watch-and-feed pet rather than one to hold. Children get plenty to engage with: the shrimp graze constantly, carry eggs under their tails, shed their skins as they grow, and come hurrying when food goes in. The boundaries are simple…
Yes, amano shrimp are among the easiest first pets in the aquarium hobby, provided the tank is fully cycled before they arrive. They are hardy, peaceful and constantly busy grazing algae and leftover food, and they ask for little beyond stable water, a lid, and a varied diet that includes some vegetables and…
No — tiger barbs are not peaceful community fish in the usual sense, and they are the classic example of a good fish in the wrong tank. They are boisterous, hierarchical fin-nippers that harass slow or long-finned tankmates, sometimes to death, yet in a large group of their own kind, in a spacious tank with robust…
Yes, leopard danios are peaceful community fish — hardy, long-finned-free and entirely without malice — but they are among the most active small fish you can keep, and that energy shapes the tank. A spotted pattern variant of the zebra danio, they race in the upper level, chase each other harmlessly and need swimming…
Yes, celestial pearl danios are peaceful community fish — tiny, spotted fish that bother nobody, though males spar with each other in harmless displays. Their real requirement is the opposite of aggression management: they are shy, easily outcompeted and easily eaten, so they thrive only with other small, calm species…
Yes, Congo tetras are peaceful community fish — gentle giants among tetras whose size, not temperament, sets the conditions. Adult males reach around eight centimetres with flowing fins and an iridescent sheen, and they need a long tank, a group of six or more, and companions too large to be mistaken for food. Tiny…
Yes, lemon tetras are peaceful community fish — calm, schooling and long-lived, with a soft yellow sheen that deepens in a well-kept tank. They hold a mid-water position, ignore other species and keep their brief squabbles inside a group that should number at least six. Lemon tetras are hardier than the delicate…
Yes, glowlight tetras are peaceful community fish in the fullest sense — small, gentle and entirely uninterested in other species, with no nipping habit to manage. Their iridescent orange stripe catches the light best in a softly lit, planted tank and in a group of six or more, where they shoal calmly through the…
Can't find your question? Ask it here. We answer reader questions in KinsLe Answers — and we'll email you when yours is published.
KinsLe is launching soon — and the waitlist hears the date first. Join for launch updates and first access when the app opens.
We email you about the launch. Unsubscribe anytime.