I have a 37g reef with 3.5" DSB, 80 lbs mixed figi and Marshal Isle LR, 175w MH with 55w PC actinic, Bak Pak skimmer, CPR HOB refugium, and a 10g DIY sump with a Mag 7 return pump to a spray bar on the back of the tank. I keep a mix of LPS and SPS corals along with a tomato clown, firefish Goby, CBS, left hand hermits, couple of turbo, a ton of hitchiker stometella snails. I need to replace the skimmer though as the bak pak just doesn't work well in a sump (sump was recently added as the bak pak was a HOB for the past 3 years).