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you may have reached a trigger threshold for a limiting nutrient (like phosphorus) or there may be a new predominant algal specie in bloom and the skimmer is saving you from the bloom. Regardless, go with the water change, especially if you might have skipped one...
And make sure that your hands are really clean and well-rinsed before immersing them in the tank water as well, you might be surprised, it might have been something simple, like just keeping your hands OUT of the tank for more than usual, you can never really tell with some of the skimmers, it could be anything.
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Tom <"))))>(
(TDWyatt)
Wise men speak because they have something to say; fools, because they have to say something. -Plato
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