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Depends on a lot of things, including lighting (not just the fixture but also ambient light), dissolved oxygen/CO2, how often water changes are being done, phosphate content in the water source, etc...
However, a 10g tank is nowhere near big enough for a pleco. They are huge waste producers and need a lot of swimming room. I would say that a 50g is the minimum for a standard pleco, and a 20g the minimum for a bristlenose.
You can, of course, keep with this setup if you wish. It would not be good for the fish, however, and its life span would be drastically shortened.
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