I have a 29G tank with a couple endlers livebearers and about 8 neon tetras, I've had all of them for over 6 months. Today I noticed one of my tetras was just sitting near the bottom very bloated and its skin looks "fuzzy". When I went to scoop him out with the net he barely tried to swim away. does anybody know what this could be? also another one of my tetras looks like he might possible have a spot of ich but I have no idea where it couldve come from as nothing new has been added to my tank for months.