I had bad luck with my dwarf gouramis. For some reason my water wasn't right or something. All my other fish were basically fine, but those guys never did good with me. My luck since they were my favorite fish at the time. Anyhow, mine got a red streak vertically behind the head down the body and then they would turn whitish in that area and then die. Basically, the whitish came from whatever it was eating their skin dead. It really sucked since I tried hard to keep them well and came up with no answers in the end. I won't buy them anymore and that saddens me as well, but I don't want to kill anymore of them either. I also did plenty of water changes and that never helped either and also put them in a quarantine as well. Nothing worked for me. I hope it all works out well for you. I am the gourami killer unfortunately. Many people have good luck with them, so good luck to you as well.