I have a 30 gal and have had flatworms for atleast a month now, my yellow wrasse does his best but cant exterminate all, I have seen some really big ones and am wondering on your opinion with flatworm exit. I have what seems to be quite allot with me catching 5 just at night with my own eye I am scared there will be to much and could kill the corals and fish do you think it would be a good idea?