You can scoop out what you can and with more regular water changes it should gradually disappear. It often grows when either a tank is still new and/or cycling or if the bioload is too large. Poor water quality is a cyano magnet. You can also use Chemi-clean if you want to get rid of it in a hurry. Also IME some hermit crabs will eat it as well as some conches. Don't use a sea hair, they will likely eat it but often die from it poisoning them.
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Greg
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