Agree. The less you do in there right now, the better. Minimize feeding, reduce the photoperiod, and let it run it's course. Keep up with required water changes, but that's it. You can wipe the glass or whatever is easy to reach without disturbing the gravel, but that just stirs up the diatoms you don't collect on the scrubber/sponge right back into the water column again. So there's some benefit, just not a lot. Six months is about the right timing for this. You could add in a large bundle of fast growing plants, preferable with pond snails.