Wondering if anyone can help me or give me some pointers with my Reef Octopus BR 110 biopellet reactor. I currently have a 300 gallon set up with a Vectra L2 (3100 gph) for my return with a manifold system. I currently only have a UV sterilizer attached to my manifold and was trying to add the BR 110 biopellet reactor. I have tried multiple times to get the biopellets to tumble but they just won't. The water flows through the reactor but the darn pellets just won't move. I am using the BRS recommend amount of biopellets (1 cup to 50 gallons of tank water). So I was thinking there may have not been enough water flow or gph through through the manifold into the reactor (which it states the BR 110 reactor needs 800 gph), that's when I decided to go out and buy another pump that hooks up to my Red Sea unit that is rated for 530 to 1450 gph, and hooked it straight up to the reactor hoping I would get some tumble. WELL Guess what........still no tumbling of the biopellets. No I am begging to wonder if the reactor is defective or am I just doing something really dumb. Thanks for your help.