I've had this problem before with other fish and can't figure out why. Just got new male betta and within a week, he had white, whispy things floating all throughout the water. I've tried everything...taking out aquarium salt, using melaleuca, etc. It's so gross, I'm changing his water every day, which I know is bad. I've had many bettas - I'm not new to this. Have one female betta who is over 5 years old now! Her name is Sharky.
But this problem has me stumped. Does anyone have any advice please??