Mal, I love your tank, it is so beautiful! It really makes me want my own. As for the seahorses, well, believe it or not they are predators (albeit toothless ones!) in the sense that they eat live food (ghost shrimp or even small fishies). I have heard that some will eat frozen food, some won't - be that shrimp or bloodworms. But, anyway, the only reason I know all this stuff is because there is a whole little room full of different types of seahorses at my local aquarium, that I like to go in and wander around (wishing they were mine - lol) while my daughter takes her classes there. For some reason, I always seem to show up around feeding time! lol