I have a 55 gallon tank, and i have 1400 gph koralia power head on either end with a lot of water flow. The problem I am having is that all of my wish waste seems to creep back to the back of my tank and just kinda decays there. I was not sure if that was okay and if the bacteria was going to eventually eat it and if I should put the power heads in a different angle to get more flow to the back of the tank?