do what I do, get some molly's, (gupies could do it too) and convert them to SW !!!!
its not hard, add a bit of SW to it and bring the salinity up to 35 or whatever your SW system is at over 4-5 hours. dripping works the best.
feed them HIGH quality MARINE food. after a couple days, you have a marine fish

with alllll the nutrition
I feed my molly's HEAVY with marine algae and pellets, carotenoids (carotein bits) and even phyto ! lol
their fry can then be used
the molly fry is fast, although pipe fish when healthy is faster, and cooler at hunting, give the fry 10 mins and it will be eaten
only Issue with molly is that their fry is somewhat big, my seahorses have no Issue eating them, but pipefish needs to strike it 3 times to get it.
although, I highly recommend switching to frozen food, add some mysis to a little cup, with the molly fry

add al to the tank, eventually, remove the fry from the mix, the pipe fish will eat the mysis. (as they would get used to the taste and smell of mysis as food and ... )
BUT, all this needs to be done in a seperate 5-10 G tank, dont put molly;s in ure seahorse tank. just the fry and if not eaten, remove it.
the pipe fish will eventually corner the fry and eat it.
ORRRRR
an injured fish isnt that fast

I AM NOT SAYING INJURE THE FRY, or am i