I second emc7's notion on the tank temperature. Ich tends to thrive below 75 degrees.
Two comments: next time you add a lot of fish or set up a new tank, try using a product like Bio-Spira. This is live bacteria and it will help to manage the bio load caused by the fish. I know that Bio-Spira is controversial but I have had success with it and so has every other person I know who has used it.
Secondly, I have to tell you that Aquarium Salt is a gimmick. You can use a much cheaper alternative like Kosher Salt. I don't think that you need an amount anywhere near 8 tablespoons unless you are keeping Mollies. They like salty water.
|