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  Angelfish Care: Tank Height, Group Size, Water and Tank Mates

  Angelfish need height more than floor space, and the sources disagree on how big a tank that means. Water ranges, group size and which tank mates are safe.

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  Cherry Shrimp Care: Water, Copper and Which Fish Are Safe

  Cherry shrimp are easy until copper or the wrong fish show up. Water ranges from several sources, where copper hides, and which tank mates are safe.

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  Corydoras Care: Group Size, Sand or Gravel, and Water for Three Common Species

  Corydoras need a group of the same species, a soft substrate and clean water. Temperature and pH from two sources for bronze, pepper and pygmy corys.

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  Guppy Care: Tank Size, Water, Temperature and Why They Die

  Guppies stay under 2.5 inches and like hard, neutral to alkaline water. Tank size, temperature versus lifespan, tank mates and why store guppies die.

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  Neon Tetra Care: Tank Size, Temperature, Group Size and Common Problems

  Neon tetras stay about 1 inch and want a group of 8 or more in a 14 gallon tank or larger. Where the temperature and pH ranges disagree, and what to watch for.

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  Betta Tank Mates: What Can Live With a Betta (and What Can't)

  Which fish, snails and shrimp can share a tank with a betta, with a heat and size check for each, what to skip, and what hobbyists actually report.

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  Axolotl Care Guide: Cold Water, Tank Setup, Laws and Cost

  Axolotl care for beginners: 60 to 64 °F water, a cycled 20 gallon long, sand or bare bottom, food, state laws and what a setup really costs.

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  Betta Fish Care Guide: Tank Size, Heater, Food and Lifespan

  Betta fish care in plain terms: 5 to 10 gallons, a heater, gentle filtering and one male per tank. Lifespan, food, tankmates and common problems.

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  Goldfish Care Guide: Tank Size, Food, Water and Lifespan

  Goldfish can live 10 to 15 years, but most die young in tanks that are too small. Tank sizes, water, feeding and tankmates, with sources.

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  How to Tell if a Guppy Is Pregnant (and When She'll Give Birth)

  A dark gravid spot and a squared-off belly are the signs. How long guppy pregnancy lasts, how many fry to expect, and what to do before and after birth.