Dwarves are DEFINATELY a challenge. I have not kept them, but done tons of research on them because I would like to attempt them one day.
You'd need a 5 gallon tank (a 10 gallon will need at least 5 pairs to keep the population up, and be able to consume all the BBS you will have to feed in such a large tank). 5 gallons will be much easier in terms of keeping the food concentration high. I'd get 3-5 pairs in a 5 gallon. You must have no live rock or live sand, and you'll need to carefully decorate the tank so they have lots of little hitching posts.
You'll need to hatch live baby brine shrimp daily, and feed twice a day at least as has been mentioned before. You'd probebly have to hatch twice a day to keep the artemia fresh and most nutritious for your dwarves.
The babies can be kept in the adult tank, and should not be separated (from what I've read).
Anyways, its tons of work, and I actually advise you start out keeping larger seahorses first, they are much easier (especially if they eat frozen food).
If you do decide to go with dwarves, it sounds like you need to do tons of research first.
-Diana