Fish ID - What kind of fish are these?

[Seafan]

Took these pictures at public aquarium:

#1

#2

 

[BLKTANG]

Seahorse.

 

[Daniel Reef]

Sea horses.

 

[Seafan]

What kind of seahorses are they - what species?

 

[namxas]

H. erectus...juvie/sub adult. It's a bit thin too.