BM skimmer is fine. they perform well but excel in deeper water. only issue may be the longevity of the Rock pump. DSP4000 and SP4000. I've run an NAC6 and the rock pump lasted 8 months. it performed well though and many have had much better luck than i did with the pumps.Thoughts on the bubble magus nac 9 skimmer? I have Plans to run it on my 120 gallon disp with eshopps 200 sump.