I bought a pleco a few days ago and put it in with my cardinal tetras, black neons, and danios, I woke up this morning to 3 missing cardinals and 2 missong danios, my tank lid is preatty much sealed, no way fish can jump out, or there is no wqay they can get sucked into my filter. I have a feeling my pleco chowed down on them, is this possible? My pleco is well fed since I bought it. I am very confused to where my fish went