Brown Stuff on Substrate

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Sounds like diatoms to me. This is a mature tank correct? If it is, their is a nutrient imbalance going on, allowing the silicates to flourish. Since you have no oto's, you will have to check your feeding and lighting. Reduced feedings and lighting will starve them into non-existence.
 
Diatoms are the result of too much nutrients in your water and by doing more frequent smaller water changes, twice weekly if necessary, it should solve that problem.

You are better off doing 20-30% water changes every week, with a good gravel vaccuming.

Amazingly enough, my bristlenose will consume the green and brown algae.
 
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