New Guy. Victoria, B.C.

[Aquattro]

Mark, although I don't recommend it, my tank went from 80 to 90 degrees every day for an entire month or more 2 summers ago, only thing stressed was me. I would certainly try to maintain stability with temp, but if it hits 86 once in a while, you're probably fine. The glass will lock some heat in though, so that is where I would start. And a fan.