Adding plants helps, your light on time is also on the lower side - i am assuming your water parameters look good. i am not sure of how big your tank is but if possible, you can try adding a bn pleco - it will keep it clean - else get a magnetic cleaner and it can be cleaned with couple of mins of effort daily.
Tank is a Fluval Spec 3 so no other fish can be added. I usually clean algae weekly with a scrub brush made for glass. I'll get parameters later. Was dosing Thrive but stopped until this is under control. No CO2 yet.
I wish my water parameters was that good after 5-6 days of WC my tap has 10-20ppm nitrates so... anyhow back to the topic
Stopping Thrive would help but keeping it off i guess would require regular scrubbing on your part. I have the magnetic brush so it is quick work without getting dirty.
Its just diatoms. Generally with new tanks but sometimes a random outbreak will occur. Nothing you can do except wipe it off and get algae eaters. Otos and nerites love it, and so do amano's. Amanos will keep your plants and hardscape clean, otos will work on plants, glass, and hardscape, and nerites will work on glass and hardscape. Get some nerites and your glass will be clean fast.
Brown algae actually will die off, or at least not grow as well, in high light scenarios believe it or not. Brown algae thrives at lower light levels, normally green algae is what happens due to high light. You could actually try getting a stronger light or increasing lighting in order to curb the problem.
I used phosphate and silicates remover for my tank that had a problem. I added mystery snails along with my otos. I recently took the phosphate and silicates remover from the filter and the algae came back. That tank gets about 2 hours of late afternoon/early evening sun
Well after a tank leaking issue I tore down the tank and low and behold the algae was actually green in some spots, not brown. Seems i had both growing in the tank. I was looking forward to adding my CO2 next week. Dang it!