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Old 12/02/2017, 10:56 PM   #2
bertoni
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 86,888
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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