Algae
I seem to have the same problem on my sand bed. This brownish type algae seems to haunt me every time I set up an new saltwater setup. The good news is it goes away in time. My tank has been set up since the end of December but it is still cycling and it will for quite some time, I have read it takes up to a year to be fully cycled. In that time freak algae blooms aren't uncommon.
How are all of your water parameters ?
Stan
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