Seahorses.

[rayjay]

They look to be pretty small to be for sale as they don't even appear to be sexually mature yet, meaning failure rates will be higher.
Reef-keeper, the minimum recommended tank size for a pair of seahorses is 29g, with an additional 15g for each additional pair.
If you check the links at the BOTTOM of the "My Thoughts......" link in my signature, it will lead you to information that is best you have before you get into seahorse keeping.