I have a Doryrhamphus melanopleura or Blue striped Pipefish in a 50 gallon tank. Before that it was in a 10 gallon tank. Both tanks are/were SPS dominated and had high flow. Other Doryrhamphus spp. can also be kept in high flow tanks.
Although after several months it began accepting frozen mysis it didn't at first. Just went after copepods and the like on the rockwork. I even tried feeding it live baby brine with no luck. But given a lot of mature live rock, a big refugium, and no other pod predators it should be fine. I would wait at least 6months before adding one. Stock your tank with amphipod/isopod/copepod kits. Feed the tank a bit of flake as if there were fish in there. Eventually you will get a nice pop'n of pods.
Tankmates, if any, should be peaceful obviously. Gobies, firefish, cardinalfish, etc.