It's not a bad thing, with the algae growing in there, provided that you don't let it become a mechanical filter. Once it starts trapping dirt, it can grow to the point where it bocks the water flow and clogs things up.
The best thing to do is to remove about 1/3 to 2/3 of the algae from time to time. This is when you actually export the nitrates and phosphates. That way you'll prevent the possible problems.
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