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 9 of 24
Yes — the scissortail rasbora is a peaceful, resilient schooler that suits beginners with a tank long enough for its size. Named for the scissoring black-and-white tail it flicks as it swims, it grows to about three and a half inches, so it needs more room than the tiny rasboras. Keep six or more in a covered twenty-…
Not as a first fish — the rummy nose tetra is beautiful but honest about its needs, and a true beginner's early water swings are exactly what it handles worst. Its red face fades visibly when water drifts, it schools tightly and looks superb in a mature, stable planted tank, and experienced keepers love it for good…
Yes, if the tank is big enough — the rosy barb itself is hardy and easy, but it grows larger and swims harder than most starter fish. Males flush deep rose-red when settled, females stay golden, and a school of six needs a spacious tank, ideally thirty gallons or more, to burn its energy. In a small setup it can crowd…
Yes — the peppered corydoras is one of the most forgiving bottom fish a beginner can buy. Mottled grey-green with metallic flecks, it tolerates cooler water and a wider range of conditions than most corydoras, roots happily along the substrate in a group of five or six, and bothers nobody. Give it smooth gravel or…
Yes, for a beginner whose tank is already cycled and stable — the panda corydoras is charming but a little less forgiving than the toughest starter fish. Named for the black patch over each eye and at the tail, it roots along the bottom in a group, so keep six or more on smooth sand that protects its whiskers. Skip it…
Yes — the leopard danio is one of the toughest small fish in the hobby, and a forgiving choice while you learn. Its golden body is patterned with dark spots instead of the zebra danio's stripes, and it spends the day chasing and circling near the surface. It needs a longer tank than its two inches suggest, a tight lid…
Yes — the lemon tetra is a hardy, good-natured schooler that suits a beginner with a cycled tank of reasonable size. Its soft yellow body and red eye look washed out in a bare shop tank but glow in a planted aquarium at home. Keep eight or more so the school holds together, feed a varied small diet, and it will live…
Yes — the honey gourami is among the calmest centrepiece fish a beginner can keep. Males turn a warm honey-orange, females stay soft silver-brown, and both move slowly and deliberately, feeling their way with thread-like fins. A single fish or a pair suits a planted ten- to twenty-gallon tank, provided tankmates are…
Yes — the gold barb is hardy, cheerful, and tolerant of the slightly imperfect water a new keeper produces while learning. This metallic yellow schooler grows to about three inches, eats almost anything offered, and stays active all day. Keep six or more so its energy stays inside the group instead of turning into…
Yes — the glowlight tetra is one of the gentlest introductions to schooling fish. Barely an inch and a half long, it carries a neon orange stripe that glows against plants, stays peaceful with almost any calm tankmate, and adapts well to a cycled community tank. Keep at least six together, soften the lighting with…
Yes, with one condition: a dwarf rainbowfish needs a properly cycled tank rather than a brand-new setup filled the same day. These small, iridescent schooling fish are active and peaceful, the males flashing blue bodies with orange-red fins, but they notice poor water quickly. Give a group room to race along a longer…
A Congo tetra can be a good beginner fish if the beginner has a long tank, because this is a large, fast tetra that grows to about three inches and needs a school and swimming room. Males develop flowing fins and an iridescent blue-green sheen over a golden body, and a group in a spacious planted tank is a striking…
A chili rasbora is not the easiest first fish, because at well under an inch long it is one of the smallest and most water-sensitive species in the hobby. It thrives in a mature, heavily planted nano tank with soft, stable water, where a school of ten or more glows deep red and behaves naturally. A beginner who…
A celestial pearl danio can work for a beginner who wants a nano tank, but it is a shy, tiny fish that needs a settled, planted aquarium and a group to feel safe. Males carry starry spots like a night sky and spar gently with each other, while females are plainer, so a mixed group of eight or more shows the species at…
A cardinal tetra is a reasonable beginner fish only if the tank is already mature and stable, because cardinals are noticeably more sensitive than the similar-looking neon tetra. Their red stripe runs the full length of the body, and a school in soft, clean, warm water is one of the great sights in the hobby. Start…
Yes, a bronze corydoras is one of the best beginner fish in the hobby: hardy, peaceful, long-lived, and endlessly busy along the bottom of the tank. Keep a group of six or more, because a lone cory is a stressed cory, and use sand or smooth fine gravel so their delicate barbels stay undamaged. They will not live on…
A Boeseman's rainbowfish is a borderline beginner fish: it is hardy once settled, but it needs a long tank, a school, and stable water, which asks more planning than a true starter species. The two-tone males, blue at the front and orange-yellow behind, colour up slowly and only shine in a group with females present.…
A blue gourami can suit a beginner, but only one who has room for it, because this is a five-to-six-inch fish as an adult, not a small community tetra. It is hardy and breathes air at the surface, yet males can be territorial, so keep one male or a pair in a planted tank of generous size with peaceful, sturdy…
Yes, the black skirt tetra is one of the better first fish you can choose, because it is hardy, peaceful in a proper school, and forgiving of the small mistakes new keepers make. Buy at least six so their mild nipping stays within the group, and give them a planted tank with room to cruise in the middle water. Their…
White cloud mountain minnows usually live three to five years in an aquarium, and fish kept in cooler water often reach the longer end of that range. They come from cool mountain streams, so an unheated, well-oxygenated tank suits them far better than a warm tropical setup. Kept as a relaxed school with gentle flow,…
Tiger barbs typically live five to seven years in an aquarium, and well-kept fish occasionally reach beyond that. They are boisterous schoolers whose famous fin-nipping fades when the group is large enough, so buy a proper school rather than a pair. A roomy tank, clean water, and companions that can hold their own…
Serpae tetras generally live about five to seven years in an aquarium, with five years a realistic expectation for most home tanks. These deep red tetras are lively and can nip fins, so keeping a proper school spreads that energy among themselves instead of onto slower tankmates. Clean water, a settled routine, and…
Scissortail rasboras usually live about five to seven years in a home aquarium when their water stays clean and stable. They are active schoolers, so plan on a group kept in a covered tank, because this fork-tailed species is a confident jumper when startled. Lifespan shortens quickly in a small, newly set up tank…
Rummy nose tetras can live five to eight years in an aquarium, but they are the most honest negotiators on this list: give them soft, warm, stable water and they thrive for years, and let conditions wobble and they tell you immediately, because the famous red nose fades to pink or grey when the water displeases them.…
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