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I would suggest and ask a couple of things.
Suggestion...... the intensity seems satisfactory in pic. Bring the whites down further and increase blues. Decrease any reds if you have to near zero.
How is your water flow? Lack of flow seems to support brown algae and hair algae and there is not much to disturb their ability to adhere to surfaces. What is your light schedule (hrs per day)?
Are you using RO or tap water?
This algae is more likely silica than algae. You can use a silicate removing resin which will help and also added clean up crew such as cerith or nassurus snails who will feed on this.
Use of a turkey baster to blast away the surface brown appearance also effective but not a solution.