a skimmer will not provide copepods
i havae not used an in-tank refugium mearly because i think they are a rip-off
my LFS sells them for like 50-60 bucks!! THink about it!! a tiny little acrylic box.... 4 suction cups, and a small poorly-manufactured powerhead for 50-60 bucks!!!
They only thing they can do is act as a holding place for macro-algae because there are holes all over it.
My LFS has a larger one on a tank where they sell the macro out of. but i think it is jsut a waste of space
i was going to go with the HOB model, but instead im making my own. Got some acrylic to make a 30 gallon coustom shape so i can fit it to my needs