seahorses like tall tanks. 8gal will definitely not suffice for even one. the reason you would want a tall tank is so they can display their courtship behaviours (requires more height than width). they do this usually in the morning and is really quite fascinating to watch.
H. reidi is by no means a dwarf so i would recommend a 30gal off the top of my head. like Anthony suggested 20g might work, but i really think 30g would be best as a minimum.
+1 on seahorse.org
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