What are deep sea seahorses with a trumpet-like mouth called

This question sounds stupid.. but I was just watching a documentary about ocean life and there was this really cool seahorse-shaped animal that looked like it was made of leaves, and it had a trumpet-like mouth. I promise I did not imagine this.

Wow, sea dragon? I thought it was a sea horse too! They have them at the Aquarium in Tampa, Florida. They were a LOT bigger than sea horses that I have seen before. Looked really neat, though.
I THINK the sign said that they live in sea weed.

What you saw was a sea dragon :) It's like a seahorse, only it's considered the ugly cousin.