Another thread I was reading reminded me that I wanted to ask about my pleco's poop 
Of course, he poops a LOT. Once in awhile I'll notice he has a long trail of poop hanging off of him. I don't see it often and the poop in the gravel doesn't look like this. I was just curious what is causing that to happen? I'm assuming it's something I feed him that does it occassionally, but haven't tracked it long enough to know exactly what yet. Any ideas?
Thanks!

Of course, he poops a LOT. Once in awhile I'll notice he has a long trail of poop hanging off of him. I don't see it often and the poop in the gravel doesn't look like this. I was just curious what is causing that to happen? I'm assuming it's something I feed him that does it occassionally, but haven't tracked it long enough to know exactly what yet. Any ideas?
Thanks!