Here is my opinion on what is safe with seahorses.
http://www.seahorse.org/library/arti...ankmates.shtml
IME reidi can grow to be 10+ inches, mine never got past 8.5 inches though, still both are to big for that tank. IMO you need to look at fuscus, tubers, or breviceps. Fuscus being the easiest to get, brevi's need temps in the high 50's or low 60's so they have there own challenges and not so good with corals. Go for the fuscus!
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The deadly and highly trained Marine Firefish, kind of like a Navy Seal, but more macho with Umbra Classification