So I have a 20 long tank with a common snapper and a Florida snapper; each about 3 months old. They are active and eating well. I use two small submersible filters, one at each side.

When I first got them, I kept them in a (well-filtered) 10 gallon tank, always meaning to upgrade because I know they need space.

Then I noticed they both had developed small areas of that white fungus, mostly on their feet and legs. It's not bad, but it's there. I thought that might be because of the close quarters and the use of the one small filter, so I upgraded about a week ago.

It doesn't seem to be getting worse, but it's still there.

I've read several different treatment theories online, but I wanted to ask the experts here: What do you recommend I do?

Will it conceivably just go away if I don't do anything? I am ready to do whatever it takes to eliminate this thing ... please respond. Need advice! Thanks.