worrying about the....
HC is a kind of sensitive one and requires good lights, CO2, and nutrients with lower pH.
From your pictures, I would do a next couple of things.
1) Get the variety of light spectrums (instead of 2x6500K, 1x6500, 1x10000K)
2) Substrates - too bad you can do anything about it now, so I will try root tabs where you plan to grow HC. (Usually soils are good source for HC growth with lower pH and nutrients in the soils.)
About the water change if it is hard to keep as a daily 10%, I will do 20%/3days.