Are you running the Nature 2 in your signature? It could be metals splashing. It also could be mold or algae if you are not brushing regularly. Last, I would keep the FC higher with a cya of 70. I'd target 7 to 8.
I only used the Nature 2 with the initial cartridge for about 3 month. I brush once a week. I have tried spraying regular bleach and brush locally, but not change. I will increase chlorine just in case.
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