i have a festae that has long stringy poo and has not eaten for about 4 or 5 days . i have already tried medicine called tremazol but nothing has changed my other fish are not eating as well. also put in new pieces of driftwood and they seem to have white slimmy film on it. i've also noticed white little worms swimming in my tank most likely planaria. i need help determining the sickness and what would be a good medicine to take care of it.