Here's the belly of a Red Sea reefer 450 and how I have it setup. I did have a reef octopus space saving biopellet reactor down there but took it out. Now it's just my NYOS skimmer and a couple bio pure plates. I have a large UV on it as well, lost my entire livestock to ich before hope this helps ya
Very nice system, corals look healthy, happy and bright! Do you have all the water being returned via Vectra pump from your sump to display go through the UV sterilizer? I thought UV requires a slow flow rate? I'm asking bc I just recently purchased a Emperor Aquatics 25watt UV sterilizer for my 93gal system and am looking/researching ideas on how to plumb it