Quote Originally Posted by d3rryc View Post
FWIW, 20 gal is actually considered TOO big for dwarf seahorses. It's hard to get the food density high enough without fowling the water. The gurus at seahorse.org dont recommend anything over 10 gal for dwarves.
Fair enough, I haven't really read anything about seahorse care. I belive there are some large seahorses out there too --Cant give any names unfortantly. Good luck with what ever route you choose to go!

Have you ever considered a mantis shrimp? One of the smaller species would go really well in a tank that size.

-Jordan N.