I have a male betta in a 2.5 gallon tank. He was in a 1 gallon bowl until this past Sunday when I moved him into an established 2.5 gallon glass tank. I noticed yesterday that it looks like he has a loose scale--I have no idea what it really is, but that is what it looks like. He seems happy, made a HUGE bubble nest that covers half of the top of the aquarium-lol.
Water parameters are normal--pH at 7.6 and all other tests at 0. I have live water sprite in the tank and it has been running for a while now--had a Paradise Fish in it before. The tank is heated at 78* and has a Red Sea Nano filter on it with the flow reduced with filter material in the intake tube.
Any ideas? It honestly looks like one of his scales is coming off. Other than that, he seems perfectly normal--he swims around a lot more than he did in the smaller bowl.