Anyone have any inexpensive ways to keep 20g tank of 4 goldfish(common, fantail, black moor and ryukin) COOL! I'm new at this and trying to keep my fish healthy of course. I don't want an air conditioner in my home but i don't want to give up my fish. I've heard of people installing fans to blow directly on the water but i don't know how to do this, also, how much would this lower the temp especially in the summer months. temp is currently at 74-76 degrees. :huh: