Hi everyone, Here I am again with more questions and more things to learn.. it seems to be never ending! To cover off, I have a 15G/60L tank with 10 neon tetras, 4 lyretail mollies (incl. one new fry, yay), and a BN pleco. They're all young and I have every intention of upsizing as the BN will get big. Over the last few weeks I've been trying to cure what I can only describe as mouth fungus on a couple of the tetras - they're small cotton-like tufts around the side of their mouths, some have little white specks on their fins. I've been medicating the tank with Melafix which doesn't seem to do any good; that said, it hasn't gotten worse. Only a couple of the tetras have it, the rest look fine and the BN and mollies look perfectly healthy. From what I've read mouth fungus/any sort of fungal infection tends to take them quickly however they've been riding it out for 2-3 weeks now and don't show any signs of distress or lethargy. I haven't got the option to quarantine them yet as setting up a secondary smaller tank isn't cheap. I've ordered some Acriflavine 5% as I've read that can help with the more stubborn ailments. Secondly, some may recall an older post I made where I found teeny tiny snails, I think they were identified as ramshorn snails. They don't get very big - maybe 1.5mm max and they breed like it's going out of style. I pick them out when I can, lure them with foods, limit how much I feed the tank, and they're still around. I pick up a lot when I do a water change and focus on the substrate, but they're back the next day. So, questions for you today are.... 1) What can I do to treat the mouth fungus? Should I leave it? Put the fish down? 2) Aside from a total scrub down of the tank, can I introduce another fish to the tank that likes to eat snails? If so, what? I've heard gourami and betta (not really compatible with my tankmates) would do the trick, or a bigger apple snail(?). Photos, parameters, etc can be supplied upon request when I'm able to.