Feeding

I have tons of copepods in my refugium, it's to the point that there are little clouds of them swarming all over the place. It's pretty amazing, I can just stare at them and all of the other stuff in there as much as the display tank. I just don't see them in the display. I'm trying to figure out if they are numerous enough to add a mandarin. The tank was upgraded from a 2 year old 55 to the current 120 last summer, and the only other place I've seen copepods as dense as mine is at Inland Aquatics. ...