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That's a tough question. I'd probably try some GFO first, since it's easy and cheap, and sometimes it helps. You could consider dosing some phosphate. There are some food-grade trisodium phosphate products available, for example, in case the bio-pellets can consume enough nitrate to limit algae growth that way. In the short or long term, though, the algae might outcompete the bio-pellets for the nitrate.
What kinds of algae are growing? Maybe a few cleanup crew members might help.
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Jonathan Bertoni
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