Gregcoyote said:It's up to you. I would have live rock in the sump with the chaeto. I am not a follower of sand beds in sumps. I know it works for many people, I just elected to go a different way.
It is, hence the "refuge" ium name. I just don't like the idea of sand in there because 1) it isn't necessary for critters to live, (at least fish-food bound critters) and 2) it's just another place that could trap nutrientsOh I thought a refugium was another place to houses all the little critters that might get eaten in the display tank