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My money is on Staghorn. Don't let slight variations in color fool you.

Also look here:

Looks a lot like this to me:

Staghorn algae:
Looks like individual strands of hair algae but tends to grow in single branching strands like a deer antler and is grey-green. Seems to grow mostly on tank equipment near the surface. Difficult to remove mechanically. Soak affected equipment in a 25% solution of household bleach and water to remove it.
Good luck.
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