I run my 450 gal
at 77 degrees with 2 degree differential. Doesn't get over 79. Fish will do fine at 82, but so will algae, parasites, and disease. I found a 1 yr old chiller on CL
for about 40% the original cost. I have back up generator for my tank, but not for the AC
on my house. If a tank is at 82 now....?