I just use a small glass bowl at the top of my highest piece of rock. You can't really see it back there and it works great! It's so cute to see all the horses line up at the trough for feeding time . People use all different types of feeding stations though, so just try whatever interests you. Seahorses need to be fed at least twice per day. I don't know about what feeding times are best, I just do mid-morning and early evening. Mine don't tend to eat for a while after waking up, so I try to wait a while after the lights come on, and be sure to feed them well before the lights go off.
HTH,
Kim