I have a 10 gallon tank that includes 4 Dalmatian mollies, 1 guppy, 2 Micky mouse tetras, 2 ghost shrimps (1 pregnant) , and 1 mystery snail! I also have 4 babies in a breeding net (not sure who the parents are). A couple of my fish are constipated. They have stringy poop stuck to them. I have heard using epsom salt will help. How much should I put in my tank?