I have gone to a Seahorse presention in Seattle. I am no expert but I am willing to share what I learned about each seahorse. I have a seahorse tank waiting to be set up.
Here are things I learned in brief.
Seahorses need things to cling on to to feed, corals like SPS sting seahorses, when a seahorse is stung they cling like we do with electricity. So you want to cover your heater with a sleeve. Very few fish are compatible with seahorses. They need to be fed daily, etc.
Nice to see you

Ed