Seahorse buddies

[revgeoff]

Well, my 30gal seahorse tank is doing very well after almost a month. So far the inhabitants are:
4 Seahorses, 2pipefish a seahare (sooo ugly it is cute), an urchin, a clam and a brittle star to pick up the left overs.

Does anyone have any suggestions on some buddies I can put in the tank? Would a couple of Cardinals be ok? Any specific gobies?

Just so you know, its a 30gal cube (more or less anyway) with a 250W MH over the top. Obviously I don't have a ton of flow as well.

Thanks for any suggestions!