I was thinking about turning my tank into a seahorse tank. I have a 46 gallon tank with about 35 pounds of live rock. For filtration, I have a Fluval 404. Living in my tank is a firefish, a feather duster, some xenia coral, two short-spined urchins, and some hermit crabs. The tank has been set up for several years, and the water quality is excellent. I plan on getting a bunch of macro-algae for the seahorses to hitch on to. I want to start with a pair of h. erectus. Any comments/suggestions/problems with this plan?