Alligator pipefish are not as hard. They are large and hitch at birth.
I didn't mean that it's impossible to raise pipefish. At this time, it is nearly impossible to raise DF pipefish. It's just not something that the average hobbyist can expect success with. No one in the US has raised DF pipes yet, that I know of. Lots of people in the US have raised Gulf Pipes and the like. People in other countries have raised Dunckerocampus and Doryrhamphus already like danfrith said. Europe and Australia are way ahead of us in Syngnathid aquaculture.
Fishkidd, be careful trying to get a pair of bluestriped pipes. Sure, they can be sexed, but if you order them online the distributor probably won't sex them for you, even if you tell them how. The juveniles of course can't be sexed, and that's what many are selling. That is how I ended up with 2 males. If you put 2 males bluestripes together, they will fight probably to the death.
If your local store can order them for you, you might be able to sex them. Mature males have bumps on the snout.