I don't know how warm the water is because the heater doesn't have a temp. reading. Its supposed to keep the water at a "contant" 78 degrees. I feed him bettamin tropical medley but he hasn't ate in a few days now. At frist, he loved the stuff. I did a 25 percent water change two days ago and use 'prime' water conditioner. Should I do a bigger water change? Also, I'm sad to say this but he looks really bad today. I thought he was dead at first so I shook the tank a bit and he can barely swim. He has his head on the gravel and his body floats upwards. It may be too late for him.
But, what did I do wrong? I've had three bettas now, and none lived for very long. Could they catch something from using the same tank? After this guy, I think I'm giving up on bettas.