My two cents:
I've always been a little wary about putting seahorses with most LPS corals because of their nematocysts (stinging cells). Euphyllias such as hammer, anchor, torch, frogspawn, etc have fairly powerful stinging cells, and are capable of injuring the horses.
Another thing, be careful when considering keeping wild caught horses. I've read some research that shows that horses from different regions have various bacteria strains, and if you were to get a horse from one location, then later on purchase another one that was collected in different waters, there is fairly serious potential in one or likely both horses dying from bacterial infections.
This risk is reduced with buying aquacultured specimens, but I wouldn't say it's eliminated. I would highly recommend ORA's Reidi horses. I've had tremendous luck with these guys, and have seen them eat frozen mysis within minutes of being released from their shipping bags.
Good Luck