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Anyone any idea what kind of algae this is, and what causes it? Not seen red algae before, it actually looks quite striking against the green hc and hair grass.

Hi all, Since adding pressurised co2 to my tank (was previously using dosing easy carbo only) I'm getting great plant growth but over the past week I've been getting green water. I've upped the amount of water changes but this only reduces it, doesn't get rid of it. Any suggestion on what I...