I have never kept em. I started doing research on their requirements, and abandoned the project. They require a tank that is dedicated to sea horses, no agressive tank mates, live food, steller water parameters, and the tank has to be a Tall tank. depending on the breed, 30 inches or taller is recommended. They need lots of things to hold on to, ie decorative micro algae(making lighting a challange cause the tank has to be deep). They need lots of vertical swim space. They are notorously picky eaters, and they arent very fast swimmers. Live misid or brine shrimp is required. And everything i read makes them seem so delicate that only a decated and experienced aquariust should attempt it. if the water parameters, or temperature get off even a bit, they get sick. If the salinity gets too high, too low, or changes too quickly, they simply flip over and die.
I think they are wonderful animals, but i dont want to risk killing them personally. I work 12 hrs a day 5-7 days a week. I dont ahve the time to care for them properly.....or the equipment.