hey guys, my 2 perculas have this white stringy thing hanging from their anal area. Ive looked some stuff and the only thing i can come up with is brooklynella..i dont know if it may be something else. I have read up on coppersafe, but read that its not good for live rock or inverts. i bought some fish food medication pellots, but they are not even eating. One of the perculas mouths wont close, as it just stays open continuously.Any suggestions on what it may be and any recommendations to treat them would greatly be appreciated. thank you.