Aquarium Temperature: What's Right for Your Fish?
Stable, species-appropriate heat is critical.
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Know your fish
Most tropical community fish want 75–80°F; coldwater fish like goldfish and white clouds prefer 65–72°F. Mixing the two rarely works — match tankmates by temperature.
Stability over perfection
A steady temperature matters more than an exact number. Avoid rapid swings — they stress fish and trigger ich. A heater with a thermostat plus a thermometer keeps it constant.
Watch summer heat
In hot weather a tank can overheat. A fan across the surface, a slightly open lid, or reduced lighting helps. Above ~86°F, oxygen drops and fish suffer.
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FAQ
What temperature should my aquarium be?
Most tropical fish: 75–80°F. Coldwater fish like goldfish: 65–72°F. Keep it stable and match all your fish to the same range.