20180613_093100 (1) by Rowan Heneghan posted Jun 13, 2018 at 10:01 AM A few weeks ago I started a community tank with a neon dwarf gourami. I wasn't given the opportunity to examine him before taking him home, and I noticed he had a gash under his fin. I optimistically continued as normal, adding a bunch of salt- and then later learning that salt isn't great for the snails and catfish in the tank, and stopping- until this morning I noticed that some of the dull spots that I assumed were normal along his back have white fuzz on them. I'm worried its Columnaris- my water quality isn't great, I've been dealing with an ammonia spike from adding too many fish at once. i have him in a quarantine tank now, I added some stress coat, but I don't know what to do now! What should I treat him with? What should I treat my main tank, with otos, corys, neon tetras, and nerites, with?