I have had zoas closed up since I moved everything from the failed Red Sea. I almost either rented or bought a par meter this week. One thing I have learned is with this hobby you always end up with an attic of equipment that you just do not use. Instead of buying one I had a though, there has to be people already that have the same lights as you and list the pars at different levels right? Sure enough I found a BRS video showing my exact lights over softies and guess what? I had them way too dang high. I am scaling them back and likely that will also fix a few other problems I have had. Tank still looks great though.
From what I gather with my xr15 pros, with my spacing and tank height I should have the pros at 55% percent or so with softies and LPS, I mainly have softies though. I was running them at anywhere from 85-100% while testing different things, I never dropped them as low as they needed to be. With the high lighting I was doing nothing but encouraging algae growth and blasting my zoas with too much light. This week I also increased the lighting over the sump and that piece of grape caulerpa I got from Bill is already triple it's original size. It was almost dead when I first got it.