chaeto and calupera are the best but calupera requires calcium as well so you may need to dose more.
i think chaeto would do almost as well as an ATS if you gave it as much light. Everyone puts a small ass bulb over the fuge so only the surface of the chaeto will get light. if you keep the chaeto moving in a tumble then all parts of the chaeto get light and it will be more effective. Throw four t5's over your fuge and get the chaeto tumbling and then you can compare an ATS with a chaeto fuge. Otherwise the ATS will always win (higher flow, more light, greater surface area)
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