I think that's sort of normal. The pellets are both a food source for bacteria and a growth medium for bacteria, so at first when introduced they are a food source for bacteria but the bacteria has to colonize the pellets. After colonized they should easily outcompete the cyano bacteria but it can take a couple weeks.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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