What Baller said.
I've been gone some days where the ambient air temp increased the water temp to 82-84 and that's when my shoal starts tearing eachother apart, you soon will see some bad aggression and that's when u want to lower temps.
I've seen a show where they lowered a shoal of rbp to 60 degrees and they all died and he did it over the span of 24 hours with a chiller
Go S. Vettel #1 rb8