I've generally noticed more PE on SPS at night (when I've had SPS that is), although it would vary, over time it would change to all the time and then switch around I guess.
One thought, when are you pumping your zeovit reactor? Maybe there's more "mulm" in the water column at night.
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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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