The tank does look fantastic, agreed. Shiny new lights!
I have a question, when you do a water change, you take three out and put three back. One bucket full.
Edit- that's what I can make out.
Try this, a.m. take out two or three buckets, add one bucket, this will have a greater effect as you are diluting more of the measured levels.
P.m. Then fill up 1-2 buckets return level to full.
Ideally one third of removed water goes back, then the remaining two thirds later that day.
The first "change" must be enough to reduce levels, the second "top up" will be slightly larger to allow for more tank water volume.
If you change water, remove/replace per bucket it only slightly reduces levels. If you take out all the water for example 50% at one time then refill the new water does more work.