Hello! I have five seahorses in a 46 gallon tank and I have not needed a skimmer in there yet. I feed carefully, with a feeding station, and perform a 10% water change every week. I have had great water quality and no problems with not having the skimmer. So whatever one you have should be good, as long as you don't over feed. I also have a canister filter with live rock rubble, carbon, and a sponge that is changed regularly. I point the output spray bar at the surface for some surface agitation, and also have a small powerhead for some more flow.
I have not had problems with bubbles during water changes, I could be wrong but I don't believe adult seahorses are too bothered by minor bubbling.
I used to feed only mysis but I've started adding in some enriched brine shrimp and the seahorses seem to appreciate the variety. Still primarily mysis though.
Haven't tried raising any fry yet, but good luck to you if you try! Of course you have been to seahorse.org, they have lots of info on that sort of thing.
Good luck! Keep us posted!
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