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I had the same tank setup.
I used only 2 MH retro's. One on each side. My rock work was an island on each side of the tank with a shelf rock with zoos on the top connecting the 2 piles of rock work. It looked fantastic.
They can blow away if the rock is too crowded and they can't get a hold with their foot.
I was having this problem weekly so I pointed a power head behind the rocks to blow the Ric's. out to the front of the tank. That's where they sit now attaching to the gravel so I can glue them to the rocks.
Re: Apataisa Moving around ????
I've seen them move before.
Once I squirted one with Kalk past. Two days later, he popped his head out a hole on the other side of a 6 inch rock