Brown algae loves light, maybe the substrate is reflecting it and thats why it grew the most there.
If I add PH Down to my tank I get a brown algae outbreak so I'm a believer in the claim that phosphates lead to brown algae.
ps I only bought the PH Down for my hydroponics and tried it on the aquarium out of curiousity. All my fish are comfy in L.A. tap water.
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