I just finished reading this entire thread. Very informative. I also called Big R farm supply and they carry Levasole for pig, in the bottle of powder form, and Levasole for sheep, which is a tablet form. They're currently out of the Pig stuff but will have more next week.
I have a 29 gallon frag tank with some planaria and a 75 gallon mixed reef that doesn't have any visible planaria, though it has in the past. I do plan to treat both tanks, JUST TO BE SAFE...lol. The 75 does have 3 clams and a Purple Sebae anemone.
Does anyone see any problems with doing a "precautionary" treatment in the 75, even with no visible planaria?