Hi. I just switched a 55 with Mbuna over from gravel to sand. I love the sand and the fish seem to be enjoying it. The parameters are all good. However, I have a Fluval 305 on the tank with 2 sponge filters and am dissatisfied with the poop left behind in the tank. I just ordered another FX5 off ebay ($219/delivered) !!! I intend to put it on the Mbuna tank. Can you advise me on whether this is too much filtration for a 55? I'm hoping it will be powerful enough to suck up the solids better. What do you think?