Mark, the 600 had to go...12 years old and some seam problems. I still have the 550 bowfront but now more of LPS then SPS. Took sea horse down too many babies and a lot of work. I will get some pictures of filter room this weekend. Run a MRC Skimmer with four becketts (rated for 3000 gal tank) Run a prodibio system with weekly dosage of Bioptium pro,Biodigest Pro and Reefbooster Pro. Daily dose of 2 caps Amono acid and 3ml of Vodka. I believe the vodka aids a different bacteria then the Prodibio. The vortechs on one side create enough flow where the fish turn into the current and then change direction when the other side of the vortechs fire up. The tunze in the middle adds additional current to the SPS in the middle of the tank. The gyre created circulates the water completely one direction for 6 minutes then changes direction and turns the other four vortechs on the other side for 6 minutes. The undertow created adds turburlance in the middle of the tank. I tries all 8 vortech pumps at one time and they tend to work against each other actually creating less flow. I would have never believed it until I tried all 8 pumps at once. Steve Hurlock