vampire pleco

I have a few New World Cichlids, a bichir, a vampire pleco, and some African Cichlids (between two tanks). I read about someone using tilapia to feed their bichir so I decided to give it a try. My bichir loves it, my severum is too small to really get much out of even the smallest chunks but...

My vampire Pleco has been nothing but healthy over the past year, but this morning I went to work after feeding him. I came home, and I noticed the food was not eaten. I looked for him, and as usual he was in his castle hiding but something was off. I took the castle out, which revealed white...