Well I am using a pump to filter and add air to my 300 gallon tank. It is much cooler outside than what my water is.

Will the pump setup up like a fountain or waterfall make the temp drop faster from the cool air outside than if I stop it.

I need to know asap as my water is 60 now and I do not want it colder than that, but it is 48 outside.

Should I continue to leave the pump on or turn it off to keep the water as warm as possible until the sun warms it again tomorrow.

It has a few Tilapia in it right now, that is why I need it warm, and I do not have a heater at this time.

Any other ideas to keep it warm til these cool days leave for good.

Thanks