Well, with 1600 total watts of lighting, you'd better have more growth! Jeez!
I think you missed my point. As a recent convert to SPS I was sharing my success with fellow clubmembers regarding a favorite blue tort frag, not bragging that the home recipe was any better than B-ionic, although it IS orders of magnitude cheaper and, IMHO, about as effective. I think at a gallon or so per mixture each month I'm spending about $12-15 a year for Ca, Alk and Mg combined. I believe that a reef tank can be successful and eye-pleasing without spending thousands upon thousands of dollars on a complete reef biology lab.
I used 3x175W 10000K, supplemented with 260W 50/50 PCs until a month ago, then switched to 14000K's and half 50/50 and half actinic PCs. I'm very happy with the growth considering it was just over an inch tall in January and I'm not keeping my local electric company afloat. One reason I'm allowed to keep the tank is that I can tell my wife that the big expenses are in the past--except for a fish or two--or three--oh, and that crocea I've had my eye on! So for that reason alone, I have no plans to change a thing.
Nice alveo and clavularia specimens, BTW.