i have my tank is 85-86, they are very active and when i do waterchanges which is usually a tad cooler (like as if it is raining in the wild) i find they just go hide under my filter intake till water get up to par temp... but once they reach 10"+ im going to drop my tmp to 80-81 like my other tanks...
higher temps ive beent old will make there metabilsim works faster which there more hungry and will eat more in a result to grow faster as well, but also comes with more aggression as well, mine are pretty tame at 85ish deg towards other in the tank mind they do have there times lol