I actually just had this same problem and since I use multiple Kessil 360x on my display, I went with the A80 on my frag QT (SPS and some LPS). However, the light penatration (and coverage once you have to lower it) is not very great and I made my own 8 inch high frag tank so not much water to go through. I ended up both lowering the light quite a bit and raising the egg crate I'm using to get the light I wanted. I have a PAR meter, so wanted to acclimate slowly to approximately what light they will be getting in the display. After all that, it is working great and I really like it. I would do it the same again, but I'm covering 24 inches square and right now mostly placing near the center under the light to maximize it so may add a second one at some point.