I noticed today that one of my danios had what appeared to be a blister hanging out of his mouth.
It was like a bubble, and he was more active than usual. He ate fine, but now I got homw from work and its like whitish stringy substance in his mouth. It appears to come out and then go back into his mouth. I got the best pic I could, but damios don't like to hold still for the camera. You should have seen me trying to net him. I put him in a quarantine tank. All the other fishies look healthy. Anyone know what it is?