How rad are these...

That's great! When I was at the Mall of America in MN, Underwater Adventure had a great seahorse display too. The Como Zoo there had a Tanganyikan cichlid exhibit I loved!
 
Ah -

Monterey Bay Aquarium where I volunteer has a HUGE seahorse exhibit. The leafy sea dragons (pictured in OP) were AWESOME!!!
 
does anyone actually keep these in a private aquarium?

From what I've read, they are close to being on the endangered species list and the regulations to keep even in public aquariums are super strict. I believe they are next to impossible to breed in captivity. Even if someone was to keep them in a private aquarium, good luck finding information on their living conditions and all that. I'd be just fine if they were left to the experts or nature to handle.
 
Groovy that it is so rad it makes me wanna go thrashin on an engine all night,yo!

which decade did I miss?

Really awesome picture. first time I've ever seen one that wasn't on tv.
 
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