My betta seems to spend most of his time laying at the bottom of the tanks, and I don't know why. He looks perfectly healthy and has been living in the same tank with the same food for a few months although I did re decorate the tank somewhat recently. Nitrates are all good, water is very soft and acidic. The temperature is somewhere between 78 and 80 farenheit (I'm not quite sure as the heater and thermometer disagree by like two degrees). he just lies around a lot more than he used to. It's a 10 gallon with a few plants and a piece of wood that he can hide in if he wants to. Only tankmates are two nerite snails. Is the tank too bright? Would some floater plants help so he isn't in direct light all day?