Sounds like algae. There are some types of algae that pleco's won't eat. Some pleco's don't eat algae at all. As tanks mature, sometimes the algae type that thrives changes. You can hasten that along by changing the type or intensity or duration of your lighting. You might get a greener type that the pleco will eat. Worked for me anyway.
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excessive nutrients is another cause for brown diatom growth that can be easily adjusted by the tank keeper. pull back on the feed volumes and/or eliminate wasteful foods (eg. flakes) that head into filters uneaten, reduce the lighting intensity by lowering the wattage of your fixture, and up the w.c. volumes into the 40% range. HTH. 
Excellent advice :thumb:lloyd said:excessive nutrients is another cause for brown diatom growth that can be easily adjusted by the tank keeper. pull back on the feed volumes and/or eliminate wasteful foods (eg. flakes) that head into filters uneaten, reduce the lighting intensity by lowering the wattage of your fixture, and up the w.c. volumes into the 40% range. HTH.
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