Hi all, I have a 75 gallon AGA mixed reef with SPS. I'm upgrading the lights and have decided on radion pros. I have been doing a lot of reading and researching. My question is can I run 2 XR-15 pros on my size tank? 75X24X21. I have been reading that most people have the 30's turned way down on a tank this size. Have read a lot of people changing to the 80 degree lenses as well. The 15 has 80 degree lenses and comes with 60's if you want to change them. On marine depot ' s review the guy had an xr-15 in the hood beside an XR-30 over a 150 and I couldn't tell the difference. I was thinking about trying two XR-15's for now and if it wasn't enough I can add more later. Thanks for any help.