Hello, I am new here and I am at my wit's end (and also worrying my head off!)
A little history. I had a 30 gallon tank successfully set up with healthy fish for a good six months. I only had 7 fish in there, but all of them suddenly began to die, except for 1 algae eater. I thought there was something wrong with the water, so I cleaned everything and set the tank back up, cycled it, etc, starting with 2 giant Danios, and the remaining algae eater who did well, ate like pigs for a few days before I figured it was okay to bring some fish home, and the guy at the petstore, who seemed quite knowledgeable, said it would be okay to bring home a small amount of fish to start out.
I brought home 2 dalmatian mollies and 2 swordtails last night, and they seemed to be doing great. The mollies seemed lethargic, but I figured they were stressed out. Now tonight, they're showing signs of cottonmouth disease (I can see the whiteish stuff on their fins and around their mouths.) . I'm currently treating them in a bath of aquarium salt, and they seem to be tolerating it well, but my problem is this..
What do I do now? Am I doing enough, or should I use something like Melafix as well? Do I put them back in the tank, or is the tank now "infected", such that it has to be cleaned? Should I also treat the fish who aren't showing signs of the disease?
Need help quickly, thank you..