I have some poly filters my wife made for me that I put the overflow hoses in. This catches the dead worms when they go through the overflow. The seem to turn into floaters when they die.
I was going to treat my tanks again, but my Yellow Coris wrasse in one tank, and velvet nudibranchs in the other, seem to be slowly knocking them down. I've never seen the nudibranchs, but I assume they are still alive because the flatworm population is down considerably. They probably come out at night when I can't see them.
Gary
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano