i recently got a 80gal. hex tank. i have a fluval 304 and a powerhead 802 with an under gravel filter (white plate). i heard that i had to do reverse flow on my powerhead so water is sucked and pushed down. their is a picture on the side of the power head that kind of tells to how to do it. i did do that and over night 2 of my daughters african frog got stuck in the vents on the side. i dont think that was suppose to happen. can someone help me with this problem. :dive: :help: