When my tank heats up I just turn one a fan and point it towards my tank. it seems to work pretty good. If you know it will be hot I suggest that you turn the fan one the tank before it heats up and keep it on till the temp drops at night. I heard that you can float a bag of ice in the tank to cool it also but I haven't tried it, to afraid to get a hot and cold spots in the tank. You should be fine with just a fan and try to keep the lights off on the tank if possible too.