So I live in the Midwest and it’s starting to heat up… my room does not have air conditioning, and my tank is at 88F with the heater off. It has 8 celestial pearl danios… how do I cool this puppy off… HELP!
Remove any lids. Limit any additional heat source such as lighting to the minimum necessary. A fan blowing on the surface will reduce the temp by a few degrees. You can use a household fan or there are inexpensive clip on aquarium fans designed for the purpose. It will increase evaporation so top ups will be necessary.