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Definitely remove the PO4, but to get rid of the cyano, and if you' want to run carbon anyway, consider trying Boyd's Chemi-pure Elite, which has carbon, GFO (phosban essentially), and some red-slime algae remover all in the same bag. I've been using chemi-pure for a while (not the elite because I don't have red-slime problems, and run a seperate GFO reactor) and I'm a big fan. Water is clearer, and algae is very slightly less than it was before, but there are so many different sources and things that effect algae, I can't say chemi-pure will fix all of that. It's just a nice supplementation to normal algae preventative measures.
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