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Well, that’s why I will stick with the gfo route first. I had great success with macro algae before but all died out and can’t grow them now even with high phosphate. Then I had an algae bloom and wiped out most of the culerpas I had.
If you had a sufficient amount of nitrate and phosphates, like really did, you should have considered adding some iron. That’s all chaeto needs and if it doesn’t grow then one of those is missing.