this is an amazing tank, How in the world did you come up with this idea ?
About 10 years ago, I was really into crabs. I was a new guy in the fish industry and got a job at a fish store. Learned a lot and seemed to have a knack for it. I very quickly became bored with corals, and liked the life AROUND the corals so much more. Shrimp, lobsters, mantis shrimps, and of course, crabs. I had attempted something like this back then with freshwater and driftwood sticking out. Was fine, but not much activity. I then attempted "this" with saltwater but the rock exposed dried out, smelled and no crabs or anything would go up there. I even put one hermit up there, it's shell stuck, and it cooked in one day. BOO! I stunk!
Well, in the summer, I became bored with my reef tank at the time (I tossed some shots below just for reference...) and thought what is the only thing more exciting to me than a reef tank, and I remembered my long failed idea.
Well, planned it, used common sense and experience, and got this going!!
Like that LOOOONG answer?!
(just posting my previous reef tank for fun....)
Here was my tang pair in the previous tank. The purple tang stayed healthy when he left for the 3 months, but the sailfin got skinny, and was way under fed. He is finally starting to return to form now back in the Volcano Tank. See how pretty he was? (I never should have given him to that LFS)