Hi guys, So I added 7 harlequin rasboras to my 20g tank Saturday and today I notice that one has a white piece of fluff hanging off his lip. Here's 3 pictures. The first one is what it normal ones faces' look like and the other 2 are the one with the large piece hanging off his mouth. Is this fungus? I also have a betta in the tank. Everyone is eating well and looks otherwise normal. Thanks!