I have a 150 gal 6 foot long 18 inches deep and 30 inches high tank with a deep sand bed. I have one vortech MP40 on each side and one on the side. everything is growing ok, but everyday, I blow off the rocks and my zoas, and there is always, always,..... always a bunch of debris that comes off of it. should I increase the number of MP40's to one more on each side? for a total of 2 on each side, or on the back wall? I have a mixed reef. lots of zoas and LPS as well as SPS