According to LiveAquaria.com it is the BTA that has higher lighting requirements compared to the LTA, though as you mentioned, the BTA could move up the rocks. The water depth in my tank is about 21". It seemed to me from the reading that a BTA or LTA would work (the BTA most often came up as the 'easiest'). Deb suggested the LTA since they seem to be less aggressive and less likely to disturb other corals in the tank.
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