i would get couple of wrasess vs using medication in the tank..
When using flatworm exit, follow the directions as written. when flatworms start to die they release toxins which will cause problems in the aquarium ,when not done properly.
Try to siphon out as many flatworms as possible then, if you must, use flatworm exit.
Very nice Jerl77.
Finally, a complete tank treatment. I could only have dreamt of such a thing. Good read, and I'll be definitly checking up on his progress with the treatment. Hopefully all goes well.