At that age, they still have room to grow, but I'm sure they're certainly getting big! I would definitely keep feeding them the poultry feed. I'd give them a meal in the morning, and at night. It just really depends on how much room they have to forage. If they're in their pen most of the time, I would make sure they have food for most of the day. I cut a large circle into a milk jug and put food in there, that way my duck can stick her head in and eat it, but not spill it everywhere which wastes it. Just keep an eye on how empty their food container is when you feed them again; if the food is entirely gone then I would give them a little more than you did last time.
Two ducks would be "okay" however, if you do end up with one boy, and one girl I would DEFINITELY look into getting another one or two females because the male will breed with your female too much. (there won't be any other females, so your girl won't ever get a break. multiple females reduces the amount of times the male is mating with her.)
And, duck eggs pretty much taste like chicken eggs. Some people even prefer them to chicken eggs. There's a slight difference because the protein is higher I think, but mostly they're good eatin'
(also very good in baking!)
