when i first got my BGK i was told to keep the tank at 82, this is mostly because its harder for diseases to live and spread at this temp, and from what ive read this is probably the highest you want it to be at so i keep mine at 81 just for the safe feeling of protection somewhat although if ich got in it would spread fast, but with weekly water changes some* aquarium salt in the water and proper care you shouldnt have problems with them...dont give up on them if you get one again youll get really attatched to it and love it to death