I have my heater on the left first one and a piece of filter floss that I change weekly. Spheres in left #2 with the water flowing up and a sack of carbon on top that I don’t change as often as I should. Right #1 is UV, right #2 more spheres. Middle is just the stock return.Maybe I missed it catching up on your tank but what do you have setup in the rear chambers? I noticed you have no protein skimmer and marinepure spheres but what else you got going on?
Thanks!