Water temp affects fish metabolism and therefore growth rate. But, can anybody say by how much? Anyone run at dif temps with same species to see how much dif there really is? I have read that at higher temps u need to feed more and do more water changes. I am willing to do that if the payoff is a fish that grows noticeably quicker. My question concerns my 240 that has a dat, some silver dols, clown loaches and soon a ck. I am trying to decide on a temp somewhere between about 74 and 81. Will there be any dif at either end of this range? I can speculate, but would appreciate anyone who knows from experience clueing me in.