Wild Caught / Net Caught / Captive Raised,
Unless you buy from OceanRiders.com or some other high priced place you will most likely be buying from your local store and 99% time any seahorses other than the standards are net caught.
The imports into Florida for net caught Brazilian seahorses are unbeleivable in number and I do beleive there is not enough regluations to limit this.
I am not proud of it but the only way I could afford the seahorses I wanted was via net caught stock. 120.00 for 2 red Brazilians as opposed to the oceanrider price of 175.00 each.
Wild Caught can be converted to Frozen Mysis shrimp. The trick I used was to purchase 2 that were already proven to eat frozen, then when I added my others, they soon began a sort of compete for the food and all are eating frozen.
Horses have to have a tank dedicated to them, so any type wild or not, should not be added to a tank with any other fish or etc. that will compete for food. They are beautiful but not the smartest of sea creatures and food can actually land on their nose and they still have to think about eating it (often 2 or 3 minutes)