Ditch gyre. It is one of the ones that I don't see much water movement out of. That and short pulse. Originally liked them...until I was able to try out reef crest and tidal swell. I think the default reeflink sync for them is just that. Constant speed during lights out, but reef crest into tidal swell into lagoon before back to constant during lights out.
Well, I moved down the other MP40. I still have growth on the sandbed, but it's patchy now. The rocks "appear" to be clear. If it is a nutrient issue, I have no idea where it's coming from. I have probably "changed" the entire 200+ gallons of water through all my water changes and only feed once a day.