+1 to everything said above. Pipefish are a specialty species and should really have a dedicated set up. I looked into trying these a while back, a friend in Atlanta had a setup for dragon face pipefish which are one of the easier species to keep but still rated as difficult. They prefer to eat only live copepods. They are slow like seahorses and most successful tanks I have seen for them are macro-algae displays. You can do live rocks and corals however these fish are sensitive to corals that have a harsh sting and anemones can outright kill them. So setting up their biotope should be done with care. Next is they should really be housed in a system of at least 50 gallons for proper pod populations to flourish. Finally, at least with dragon face pipefish, they can be kept with seahorses or other very peaceful species such as dragonets. Although had I done it, I would not put any competitors for food in the same tank unless I was over 75 gallons.
Thanks for asking in advance before just picking them up. I am with DDElozier, too often we see the post, that says, I just bought this, can someone tell me what it is and how to take care of it. That is a dangerous way to stock a tank in our hobby where our critters are often times toxic to one degree or another, specialized feeders, earth movers, shell stealers, coral clippers, invert ingesters, social, anti-social, jumpers, hiders, some like nutrient rich water, some like no nutrients. You get the drift. Keep up the research as you stock. I always like to do a stocking list in advance to make sure everyone is compatible and that I have the right equipment and parameters for all.