[Bear]

What I mean't by tank depth being important is the coral placement I guess. The depth of the tank has no actual importance, instead it is where the coral is placed. In my thinking I would always place some corals on the bottom.

If there was a 20' deep tank with Mhs above it you could keep corals, just not at the bottom. You would have to place them according to their demands.

I think the misunderstanding here was where Harif and I both see corals placed on the bottom of the tank, where the depth would matter because that is where corals would be placed.

oh and at a 10" depth I wouldn't worry about anything penetrating, just if the lights are powerful enough for the coral.