First, how big is the refugium going to be??? Indeed they do need lots of swimming space but more importantly you need to control the current for them. So you have to find away to minimize water movement as much as possible.
Second, the pods would be an excellent source of food but in order to save the pods I would feed them brineshrimp, ghost shrimp and misis shrimp.
Third, buy tank breed ponies only....
Fourth, some refugiums don't have lights... i am assuming that your's will have lights... just wanted to make sure...
Fifth, read read read the posts under seahorses here, go to seahorse.org and read... heard of oceanrider.org but never personally went there... reefcentral.com has a seahorse portion too.
Last, enjoy and post if you have anymore questions...