it is not really a problem. brown algea is a diatom caused by the release of sillicates in the glass of new tanks. it should start to go away on its own, but until that happens, scraping it off is fine.
I have a 33g tank, w/ 7 neons, 3rasboras, 6danios, 3glo lights, 1 blackphatom, 1 minnow, 2 red platys, is there a small algea eater that I can get?? Something small and NICE, that will help w/ the issue??? Thanks