cant seem to get my ray to eat... tryed frozen blood worms, she suckes em in her mouth chews on em then spits them out... did the same with a nightcrawler today. in the tank there are 3 small oscars ( all under 3.5 in ) 1 clown knife 2 pacu's 1 shovelnose cat, aro and a gar, could any of these fish be a problem and stressing out the ray? they dont seem to bother it, just raised temp from 76 to 80 tonight, LFS told me to keep it lower to make the oscars not pick on the ray.... any sugustions or is my combo bad? in a bare tank could that be the prob? or just a bad fish?