Thanks for all the responses. I have the red macro because it is nicer to look at, the urchin likes it and it outcompetes the chaeto so likely good for nutrient export. There isn't much flow, but I'm not sure I want another powerhead to add heat and take up space.
Seems like the best way to go might be just get rid of the urchin. I'll add another fish soon, which will provide some extra fertilizer too.
Regards,
Nevin
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