I thought of 3D printing an insert for the first chamber, but that would mess with the flow in that chamber. I think just dropping the bio media lower in the 2nd chamber should work.If really worried about removing some of the ceramic, you could place some under the chemipure section that appears to be currently open space. But it would interfere with the intank rack sliding all the way down. Maybe a 3D printed little box to contain it cleanly so the intank can still slide all the way down.
So hold off on water changes for a while till i see NO3 readings and control PO4 with GFO in the mean time?My opinion (running a high nutrient system) yes. Maybe don't go for the extremes that I run, but dirtier water helps coral colors.
Yep, phosphates and nitrates are the building blocks of food. Lots of people are afraid of phosphates because it "slows down the skeletonization of corals" but no one has measured by how much. Or, if a well fed coral can skeletonize faster because it has more energy despite the chemical composition in the water.That increases phosphates too, no?