What you are seeing are flukes - stay on the Miracle-Mineral-Supplement and go slow
make sure you stay on a protocol long enough to kill off the adults, the juveniles and the larvae.
MMS is effective against flukes - You could try Black-Walnut based herbals and you could look at Banyan's Botanicals parasite formula. Black-Walnut based products never did anything for me. I would add VER from Deseret Biologicals to the mix. And if need be then use pharmas such as Praziquantel.