Better hope they're not the dreaded planaria flatworms; red/brown with three "points" along the posterior end. Ron Shimek has a good flatworm ID article linked to from his author forum on reef central.

BTW Gator, so I don't leave you with nothing but bad news, your kalk reactor is coming along nicely and should be finished by the weekend. I came up with a cool (I hope) solution to the input problem, and we should be good to go soon.