I've got six female platys in my 29 gallon tank and two of them are not doing good. They have white stringy poop thats hanging from them. They are not eating well and they look skinnier than the others. I think it's an internal parasite of some type thats attacking them. My tank has ALOT of small brown pointed spiral snails. Could they be the carriers of the parasites? Should I get rid of them? What's the best way to treat internal parasites? I only have quick cure. Will it help any, will medicated food be better or should I use both? How long do I have treat them before they are completely clear of the parasites? Thanks alot for the advice!!!!!