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Not really, what's likely happening is that your water chemistry is changing a bit. Usually, as your nutrients drop, or as the rate of nutrient delivery drops, from a higher level where you're getting dark growth to a lower level, the growth will start to get lighter and usually more volumous. That's assuming you haven't changed anything else. At this point I would not worry, but I would keep an eye on it for any other changes.
Just so all the bases are covered, a few questions:
Screen dims?
Light type/description?
Photoperiod?
Tank Size?
Feeding?
Livestock?
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