Medicated food for fish?
 

I am guessing that one of the clowns got internal parasite (its pooping a LOT!!! And small white poops although not long and stringy). And became a bit finicky about flake food and is now eating brine mostly. I was thinking of feeding it medicated food.

Heard about PraziPro but is there any other "already prepared" type food (frozen/dried)?

Might try soaking a little mysis in garlic, fish actually seem to go a little more crazy for it when soaked in it.

I do soak flake in garlic from time to time but I heard that garlic isn't much use when it comes to internal parasite. That got me a bit concerned.

Thera-a
This is the only "anti-parasite" food I have ever seen. HTH

That looks promising. Thanks :)