well same thing happend to my volitan he basically was already fed and insisted on grabbing another feeder thisone super huge intended for my grouper, i thought for sure his stomach would explode which i have heard about happening , i raised the temp gradually up like 6 dgrees to increase his metabolism which worked out know i am much more careful which you should be too, if you raise the temp do it gradually like 2 degrees every 2 to 3 hours