hello all this weekend i bought 6 corydoras paleatus, for my uruguay tank. ive lost 2 of them already i find them sucked to the filter inlet. i dont knw why tho, they were properly acclimated temp is 77degrees, amm 0,nitrites 0, nitrates 10ppm. i feed sinking wafers and pellets and they are in with some tetras and some gymno grow outs andyone have any ideas why this is happening.