I have a 55 gal bow front. The top of the tank to the substrate is 24 inches. Any data on the PAR levels at 24"? If I extrapolate the numbers right, for a ray2 24" I would get ~20uMol, which I think means it would be low light at the substrate.
If thats the case, I may have to get 2 side by side, or a more powerful fixture. Any suggestions?