What's the Best Contents for a Refugium?

[blacknife]

I don't know the answer but I do know it depends on what you plan to do with the refuge-um, Nutrient reduction, pod factory or what not.

[mark]

use Chaeto in a 20g BB fuge with LR. Lots of pod in the Chaeto, don't have a problem with Ca but am running a reactor anyways. Thinking the stuff must be also be good for nutrient export as can go from a grapefruit to basketball sized ball in 3-4 weeks.