Recently I've been having problems with my 2 Little Fishies Phosphate reactor. The pump inputting the water from the sump is working ok but there is no fluidizing movement in the reactor and the is only a trickle of water coming out. I've emptied the reactor and refilled it a couple of times, check to make sure everything was patent, but am still only getting a trickle of water out of the reactor. I am using a Maxijet 400, the head is about 10 inches, the elbows look clear, the output hose looks ok. No idea what the problem is. The reactor had been working fine before. Anyone have any ideas? Thanks in advance.