Don't shoot the messenger!
Algae, like Cyano is telling you that there's a problem in your tank that needs to be addressed.
You likely have very high nutrients with no way of exporting them. Remove the algae, and your tank may look nice and clear, but you'll still have the high nutrient levels.
This is not likely to be a problem if you're using a good quality salt, but I would also test alkalinity and calcium if you haven't already.
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