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[rayjay]

Seahorses are best kept in species only tanks. It can be done but it's mostly the luck of the draw when it succeeds long term.
Seahorses are extremely prone to bacterial infections leading to death.
You increase your odds of success tremendously by keeping them in a cooler environment, 68° to 74°F because the bad bacteria doesn't thrive as well as it does in the warmer temps.
You can't have any stinging corals and clams sometimes have been known to close up on a tail causing damage allowing bacterial infestations. Sometimes corals are damaged as seahorses continually hitch to the same spot on the same coral.
Most fish are not compatible with seahorses, and, the more species in the tank be it seahorses from other breeding sources, or fish from other sources, you increase the odds of the seahorses succumbing to pathogens that they haven't become accustomed to as they grow up.
If you read the "my thoughts" link in my signature, there are links at the bottom of the page to give you the basics you need to know to get started in seahorse keeping.