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Looks like Cyano yea. If its just in that one spot, I'd say you have a dead spot there, low flow. Try just blowing it off, and repositioning your powerheads
Cyno is a bacterial problem. We have discussed this just last week in other forums. You might want to back track and read what other reefers have done. I find that most all algae problems arise from overfeeding wheter its fish food or coral foods. Good skimming and good flow does help.
is this considered chemically removing?Chemipure Elite, it uses Ferric Oxide to remove Phsophates.

