Bassman, I might try that, though I would be surprised if the light weren't enough. It's 18W of 6700K light over about 1-1.5 gallons of water in the fuge area.
Dale, my intent was that the macro would help with nutrient export as my bioload increases. I do realize that doesn't work so well if I'm dosing additional nutrients, though I think it could be useful to dose nitrogen in order to make sure phosphates are used up. Currently, I suppose the main purpose is food for the urchin.
Maybe the urchin is the only problem here. I wouldn't put it back in the display--it's cute, but makes a mess dragging everything around. Could sell it if that's the only answer.
Regards,
Nevin
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