30" deep and 30" tank. (72" long).
I'm just sort of afraid that I'll end up losing part of the actinics by having them blocked by the other reflectors (or vice versa). Since it seems you need about 3" clearance for each t5, and I'm thinking that for a 30" tall tank, I'd want to go with 4 t5's just to be sure that there's enough to make a difference..
My head hurts, I'm putting too much thought into this
(That or there's a weather system a-comin').