pipefish and seahorses tend to be difficult to feed in general, unless of course the animal you purchase has already been weened onto some sort of frozen substitution. i do know that they need to be fed several times a day in small amounts, this is what tends to make them a difficult species. i have heard that if you don't have a dense pod population that you can jump start your population, so to speak, with ocean pods.
http://www.oceanpods.com/ another route i've seen is to introduce some white shrimp
http://www.liveaquaria.com/product/p...fm?pCatId=2191 to coax the animal into feeding.
on a side note, another couple of things to remember is that you will need to plant the tank with sea grass or the like and flow in the aquarium must remain minimal. hope that helps.