My seahorses have no problem finding any food that spills over onto the sand. Once they have been trained to use the feeding station, they will come and gobble it up more often than not, but a simple bulb siphon is enough to stir the food around a little bit while they are eating. I also occasionally keep the powerheads on during feeding so that the mysis blow around the tank a bit and they get to work on their natural predatory skills.
My goal is to provide as realistic an environment as possible for them, so bare bottom would not be an option for me. I would only use bare bottom for seahorses in a very young fry rearing tank.
There are many sites out there besides seahorse.org, though they do have some good information, it should by no means be your only stop on the research train. I've posted quite a few other sources of information on threads here before, but if you are looking for more information I can lead you to a few sites where you can get into direct communication with some of the leaders in the field, rather than having to sort through just the opinions of the more casual hobbyists. I think both camps have valid information, but in my opinion some of these folks who've spent years earning the respect of the community have a bit more weight to their thoughts and ideas over someone who's never set up a seahorse tank. (Please, to anyone who's reading this, take no offense, because I have listend and will continue to listen to you guys too! Many different people at all levels of the hobby can and do have valuable information and experience! I just have the experience of almost two years with my own tank, and have done extensive research and communication with many people on the subject, from amateur to professional, from "wing-it" to scientist, and have found a few sources that I really respect and trust that have tons of experience and seem to have pointed me in the right direction! That's all im saying, so please dont read anything else into this, lol)