More than 2 to 3 degs temp change can kill some fish so temp should be adjusted slowly over hours not minutes.
are you talking about the initial acclimation time when first putting him in the tank? also the fish i think may be a little shocked because we didn't acclimate just put him in the tank..i know that's not really good to do that..also the temp now is at 84 because i was curing an oscar with ick. so now we turned the temp down some.
