
Least Killifish (Heterandria formosa)
North America’s smallest livebearer drips fry a few at a time from vegetated southeastern marshes. Heterandria formosa needs moss, micro-foods, a…
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This Fish Species hub on Fishy Friends gathers practical fish species guidance for keepers who want clear answers before they change water, livestock, or gear.
Use these articles to match species to tank size, plan filtration and feeding, and troubleshoot water chemistry without guessing. Each guide is written for home aquariums and links to related reading when you need more depth on fish species.
Start with the basics — stable parameters, quarantine habits, and a feeding schedule that matches the livestock — then browse the profiles and how-tos below. When you are ready to branch out, jump into neighbouring topics so your fish species plan stays consistent across the whole tank.
Whether you are stocking a first community tank or refining an established scape, bookmark this page and return as questions come up. Healthy aquariums are built from small, repeatable routines more than one-time upgrades, and fish species success follows the same pattern.
Explore next: freshwater fish, saltwater fish, coldwater fish, all guides.
Fishy Friends publishes species care sheets, plant and invertebrate notes, aquascaping ideas, and water-care explainers so fish species advice stays easy to find. Read one guide thoroughly, apply it slowly, and use the linked hubs above when you want a second angle on the same problem.
Before you buy livestock or rethink filtration, skim two or three fish species articles here and write down target numbers for temperature, hardness, and feeding. That short checklist prevents the most common resets and keeps your aquarium closer to the calm, healthy display you are aiming for.
Come back after water changes or new additions: compare what you see in the tank with the fish species checklists below, then follow one recommended next step instead of changing everything at once. Steady improvements compound, and Fishy Friends is built to support that pace.
Jump into popular groups — tetras, corys, danios, and more.

North America’s smallest livebearer drips fry a few at a time from vegetated southeastern marshes. Heterandria formosa needs moss, micro-foods, a…
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Rachov’s notho is an annual killifish from Mozambican rain pools: brilliant short-lived males, peat-spawned eggs, and a script that ends when the…
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Elegant rasbora is a two-spot forest cyprinid that can reach 15 cm despite the nano reputation of its cousins. Buy it for a long 200 litre tank, or…
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The lambchop rasbora is a copper shoaler from Thai and Cambodian peat streams. Espei colour up in shade, softish water, and a crowd that actually f…
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Dawkinsia arulius is a Cauvery hill-stream barb that reaches 12 cm, with dorsal filaments on mature males. It wants length, current, greens, and a…
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Males of this northern Indian barb flush pink in coolish canals, not in a 28°C community box. Keep a real school in a long tank and they stay busy…
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The Asian Stone Catfish is a tiny bottom-dwelling catfish with excellent camouflage and a peaceful temperament. Learn about its habitat, diet, tank…
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Pea Puffers are tiny freshwater puffers with big personalities and specialized feeding needs. Learn about their setup, diet, temperament, sexing, b…
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The Black Tiger Badis is a tiny, colourful micro-predator suited to peaceful planted aquariums. Discover its diet, water conditions, tank mates, se…
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The Celebes Rainbowfish is a graceful schooling fish from Sulawesi with translucent fins and striking blue and yellow accents. Learn about its wate…
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Chili Rasboras are tiny red schooling fish that suit peaceful planted aquariums. This guide covers their size, feeding, water conditions, breeding,…
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A practical care guide to the African Butterfly Fish, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Banjo Catfish, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Blue Emperor Tetra, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Clown Killifish, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Daisy Ricefish, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Emerald Dwarf Rasbora, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Golden Wonder Killifish, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Panda Garra, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Red Phantom Tetra, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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A practical care guide to the Threadfin Rainbowfish, covering aquarium size, water conditions, diet, breeding and compatible tank mates.
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Not every fish wants 78°F — unheated rooms suit goldfish, minnows, and hillstream specialists with the right setup.
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Marine tanks start with hardy forgiving fish — clownfish and gobies teach saltwater basics before tangs and butterflies.
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Killifish range from colorful annual peat spawners to hardy classroom fish — pick non-annual species first.
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