Your tank is gorgeous! I've had a 12 gal JBJ DX up for almost 4 years now, but I hadn't spent much time on it until the last few months. I moved recently and have been taking the time to give it some much needed attention. I was curious, have you changed the bulbs? and have you started dosing any additives? Your corals are amazing and the coralline seems to cover everything. I have a cabbage leather, small zoa colony, some button polyps and tons of shrooms at the moment, but the shrooms seem to be the only ones really thriving and spreading. I haven't been dosing anything, just frequent water changes and lots of cheato in the back compartment. I've been contemplating dosing some calcium/Purple Up to pump up the coralline growth but I'm scared to start dosing anything with out testing for it regularly.