I live in San Diego so for 8 months of the year I turn off my heaters and my tanks stay between 80 and 82 F. Each Fall I have to decide what temperature to set because I only have to heat my house about 6 days a winter when it is very cold (highs in the 40's) and my tanks would average below 70 F without heat. Each year I debate between saving money (20+ tanks) and keeping my plecos happy. My balance is 78 F (except for heat lovers like L46). Below 76 F I have gotten a few sick plecos that raising the temperature cured. What temperature do you set your tanks at?