I am having the opposite problem most people seem to have. I can't keep my water temps down. Air temp yesterday here was 104 degrees. When I got home at about 6pm I checked my system and the water temp in the fish tank was approaching 90 degrees. The goldfish didn't seem to be too stressed but the plants looked a little wilted. Since it is just April and based on the temps we had last summer, I am looking for ideas on how to cool down the water in the system rather than warm it up. Anyone got any input?