Just something for you to consider with the rock. I also had dense piles of rock, which I now attribute to me tearing downthe tank after many of my corals dying. I removed over 100 pounds of rock and the inside surfaces of these rock piles were disgustingly covered in detritus, grunge, and other nasty compounds. I have tons of flow in my tank.
To build big piles of rock like you have in the corner, I would have put small milk crate type boxes under as a base. Maybe you did already..?
If not, be sure to turkey baste inside the pile regularly...
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Brad
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