In my main tank I had a livingstonii that stopped eating after I noticed he had white stringy poop. I waited a day till I could get a tank setup and then moved him and started treating with tetra parasite guard. A couple days later one of my small giraffes started the same thing except it would suck food up and then spit it out. I moved it to the treatment tank also. They have gone through a full course of treatment and still wont eat. I also ended up treating the entire main tank because my Milomo started spitting food too. He only did this for a day and is eating again. Now The other 2 small giraffes are doing the same thing. This tank has gone through a full course of tetra parasite guard but the newest spitter started this morning. I also started the hospital tank on API general cure. If not a parasite what could it be? The fish look normal otherwise. The two fish in the hospital tank are the only two with white poop so far. They wont eat a thing.