My MP10 is about 10" down from the surface of the water. On the right side of my tank, where my return pump is not as strong, I have one 8" from surface, and one 6" from surface. On the left side, they're 8" and 10" from surface.
I get sand movement in the right front corner, but I'm not sure if it's the MP's causing it, or the goby. Other than that one spot, I don't have sand movement, but I get really good flow at the bottom of the tank.
Most of my sand is Nature's Ocean Bio-Activ Live Aragonite Samoa Pink. There is also some of their natural white as well as some CaribSea live sand. Yes, I bought all bagged, wet sand. I get an amazing deal on it from my LFS, and it makes it the same price as buying dry sand, but with the wet, it's less work, I can just dump it in (which is exactly what I do, lol).
They're running 85% and 90% I thought they were all on reefcrest and nutrient transport mode, but apparently Mark changed that without telling me.Now we have two of the MP40's running on opposite sides of the tank running in Lagoon at 90% and the other two opposite each other along with the MP10 are on Reef Crest at 85%
**edit - Mark and I are arguing over the actual measurement from the surface each one is, so give or take 1.5". He says they're closer to the surface than I do.
Lois, Keep in mind that my tank is not as deep as yours. When I had these on the 155, which was as deep as your tank, I had one only 3" from the surface and one was about 5" off the bottom.
