Misty, before you do any kind of treatment, varify the animal in question. If in fact it is the dreaded Planaria, aka, red flatworms from hell, my initial advice is to syphon as many as you can before they become plague proportion. Please do a search at RC using "plnaria" as the key word, I just did and theres plenty of great info along with pictures for a positive ID. Better act soon or youll be joining the ranks of reefers who are paying the price for ignoring them when they first saw them.
HTH
Jim