I hate to sound negative to you Cheeseburger. But keeping Seahorses does require a Larger system than you have. Even with Dwarf speciese, they would require a larger home.
They would require a very gentle water movement, and preferably some long leafed Macro Algae to hold onto. To succeed in keeping them well fead, they should idealy be kept in a species only system. They simply cannot compete for their food.