Sorry dude, I don't remember talking to you before, but thanks for the comments. My bad if we did. The wrasse sleeps up inside a rock, but I have seen him swimming around at night with the tang. There is no sand it's all BB.
The other two 6045s have been in the tank since a few weeks after the tank was setup. The original photo was like the day after we had the tank setup. Nice and new and clean. The flow was decent for our collection, but I added the extra 6045s to help move detris off the bottom of the tank to help with dead spots.
When we first setup the tank I was hoping we wouldn't need the extra flow to help keep the tank look clean, but there were way too many dead spots which was not acceptable. Even with all four running, there are three distinct dead spots in the tank near the front where detris settles, which I siphon up every week.
I had to do it this way in order to keep the LPS/zoas. To position the 6045s so there are no dead spots, it blows the LPS/zoas around way to much. In fact, I have to aim the return nozzles upwards towards the surface of the water. It kind of goes against the grain of having a BB/high flow tank, but it's worked out well enough. I have no doubt that a BB system would work better for an SPS dominated tank.
More flow would not be possible for the corals that we are keeping and plan to add.