glxtrix;293870 wrote: it's about circulation so nothing rests on the bottom of the tank. Properly utilizing your flow will help with this. And as always, the better of a skimmer you have the better your BB system will be.
Thats why I added the closed loop on the tank where the pump draws water from the bottom center. And by adding the grate over it, and placing the LR on top of it will help keep circulation under the rock.