125 gal Reef Aquarium

Overview of my 125 gallon reef aquarium. I bought the basics about 18 months ago on Craigslist. I've been adding and upgrading ever since. I've made progress, but still have issue with some of my corals shrinking and the others not really growing much. I'm going to focus on water quality issues (pH too low, Magnesium too low) and lighting (I upgraded to the wrong LED lights for this tank). I just added a Vertex 130 skimmer to the ASM mini-G that came with it when I bought it. I've learned the ASM mini-G is rated for a 75 gallon tank, not a 125, so I searched CL again and found a nice Vertex 130 for a good price. I don't think there are many tanks with two skimmers, but from what I read, I put the Vertex in the first chamber of the refugeium and the ASM in the second chamber. I think it will work well to really keep the water cleaner and help my corals!