Years ago, while tripping the "Lite Fan Tastic" thru the eastern area in Auck.
We, the club, were invited to meet a Chinese gentleman who bred Discus.
These were in the under-house garage area, which took up most of the area of the house.
He had no lights, and we were issued with torches to admire his fish with.
Absolutely beautiful, tanks spotless, obvious signs they were breeding.
A whole new experiance.
So maybe the brown needs LOW level, and without it, the algae does not appear.
He was also right into bonsai trees, dozens of them out the back.
Alan