I have 5 neon tetras in the tank, and 5 "muttfish" that my friend gave me.3 out of 5 of the neons have little white flecks on their fins. I have this plant the fishstore gave me that I don't know the name (reliable fish store though), but its big and fluffy with little sticks or something for leaves--almost looks like it is a bunch of pine branches, but its soft. The same or at least similar white stuff is on the plant. I have other plants but there is none on them. I'm pretty sure the plant did not have the stuff on it when I bought it. The Neon's nip eachother anyways, so they have very frayed fins already. The neon that has the most white stuff was I think stuck in the plant (or just chillin) for I don't know how long, I just walked in and he was in there. I'm thinking that it might be finrot (?), and I have some Maracyn Two--I heard some people treat there tank with Maracyn Two anyways, so would it do any harm to put some in there? I just bought 6 neons to school/shoal with the two I already had, and 3 of the newbies died--one because it was weak (from the beginning it just kind of went with the tide, you know how it goes) and 2 died because my dad accidentally unplugged the heater while I was sleeping (about 4 hours), and they were already new to the tank so it was no suprise. Doubt the deaths have any relation, but I'm just saying. Any advice?