With summer coming on I am seeing my tanks reach 81 degrees (Fahrenheit of course). The house I put at 77 when home and 79 when away. My concern is when I had a bout of ick I found above 82 my fish were lethargic. There is no direct sun on the tank. The lid is tight for the safety of fish jumping. I have researched ways to drop the temps. My question is should I bother or will the fish adapt? I have rainbows, German blues, Otto, and rummynose.