have you tried adjusting the air intake? I know they are finiky and you have to get that air adjustment just right. I have one that I am going to add a Kent venturi to. It is supposed to help with production.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,