Very nice. I just did a cleaning/trimming today too haha. I just hope my HC carpet gets as good as yours.
+1 on the toothbrush. It's quite a lot of work though. I spend about 15-30 mins brushing the rocks during every water change 2-3 times a week. Have you have any issues with the rocks moving while you brush them? I don't think I packed my rocks in tight enough when I did my hardscape and the rocks move a bit which makes it harder to brush.