Best Coldwater Fish (No Heater Needed)

Our top picks for fish that thrive in unheated tanks.

Looking for fish that thrive in unheated tanks? Here are the top picks from our species database, with adult size, minimum tank, and temperament. Tap any fish for its full care guide, then plan your tank with the stocking calculator.

• Cherry Shrimp (1.5", 5g min, Peaceful)
• Dwarf Mexican Crayfish (1.6", 5g min, Semi-aggressive)
• Ghost Shrimp (1.5", 5g min, Peaceful)
• Gold Barb (2.8", 20g min, Peaceful)
• Goldfish (Fancy) (8.0", 20g min, Peaceful)
• Paradise Fish (4.0", 20g min, Aggressive)
• Rosy Barb (2.5", 30g min, Peaceful)
• White Cloud Mountain Minnow (1.5", 10g min, Peaceful)
• Zebra Danio (2.0", 10g min, Peaceful)

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