Well, Sparky just had an emergency change of habitat. As I went to feed him tonight, I saw that his water had gotten up to 90 F!
Poor guy looked like a limp . . . well, sausage. It's 9:30 here, too dark to do a water change and put in cooler water so I transferred him to the 6 gallon Rubbermaid in the rec room. He is not happy about this and let me know about it. I could feel the water tingling as I chased him around trying to catch him. Tomorrow, I'll change the water in both his tank and the "coldwater" community and put in cooler hose water. It's only supposed to be 92 tomorrow, not 105, so it shouldn't get quite that warm. Poor Sparky!