My Sailfin started pooping out clumps of stringy things last week... almost looked like chaeto (mostly green). I also noticed him getting skinnier (but he still ate). I had some prazipro at the house so I treated the tank on Friday. All weekend he started hiding, but came out to eat and I made sure to feed him a lot. Today, he is looking a lot better and swimming around but I noticed the clumps again and decided to take pictures. Could someone tell me if this is worms? Will Prazipro work for this, or should I get something else? I planned to do a second treatment on Wednesday. I haven't noticed this on any of the other fish in the tank. Thanks.