Best Fish to Add to My Fish Tank

Fish Tank Size

  • A 20-gallon glass tank doesn’t necessarily hold 20 gallons of water when you factor in internal dimensions, gravel, rocks, and decorations.
  • Your fish will probably grow! Be mindful of the 1-inch rule and be prepared to move some fish to a separate tank.
  • Dimensions matter. Some active fish, like danios and barbs, prefer wider swimming spaces. Other less active fish, like discus, angelfish, and gouramis, are better suited for tall, narrow aquariums. Though nice to look at, narrow tanks don’t provide as much swimming space or territory as a wider tank.

Choosing Your Fish

  • Tolerate a variety of water conditions, especially in a new tank
  • Are friendly
  • Do not grow to be too big
  • Are similar in size and age to the other fish
  • Can eat a variety of foods
  • Are compatible with a variety of other fish
  • Rasboras: Harlequins and scissortails
  • Barbs: Cherry, gold, rosy, ruby, purple, and tico
  • White Cloud Mountain Minnows
  • Danios: Zebra, leopard, and pearl
  • Catfish (some varieties): Bronze or gold corys, spotted cory, bandit cory, and panda cory
  • Rainbowfish: Boesmans, celebes, and neon
  • Tinfoil, plecos, giant danios, and spanner barbs due to size
  • Tiger barbs due to aggression
  • Otocinclus catfish due to high sensitivity to toxins in a newly started tank
  • Goldfish due to copious amounts of waste-if you have your heart set on a goldfish, be sure to get a large tank
  • Halfbeaks, leaf fish, needlefish, bichirs, certain gobies, arowanas, stingrays, and gar due to predatory behavior
  • Live bearing fish due to their need for special water conditions (salinity) and because they’re more susceptible to disease
  • Wounded or damaged fins — they are likely to be more susceptible to disease
  • Cloudy eyes — this could indicate poor water conditions or disease
  • Sunken bellies — they might be chronically underfed or may have a disease

Fish Compatibility

  • Food types
  • Water conditions
  • Personalities

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24/7 pet care, from anywhere! Airvet is available nationwide to pet parents everywhere. Download the app today: https://join.airvet.com/medium