I brought home 7 CRS and added them to my 55g tank. The only other fish in there initially was 2 diamond tetras. I put them in and can only find 1 now - initially saw 3/7, but with half an hour only the one little dude. Are they hiding out in my decor? Could my filter be sucking them up? (Fluval 306) Are tetras prone to eating them ( I feel like they're mostly too big for tetras and that they wouldnt be able to devour them all that fast anyways but who knows )? I've never kept CRS before.