Looking good! I know you have some rubble in the back, but do you have any macro algae back there? That may help out compete the algae in your display for nutrients. My 18G AIO is still just sitting with CUC, sand, and rock. I added a refugium in the back with chaeto and an IM 18W LED light. Pods are hoping around throughout my tank. Again it is looking good and I am enjoying the progression of your tank.