I have a female leopard danio that looks that fat normally about once a month then she lays eegs and goes down a bit but always looks fatter than the other danios. hope that helps
i wouldnt say it was dropsy. not very easy to tell from that angle but my personal opinion is that she is pregnant. just keep an eye on her or possibly him.
De-hull means squish the insides out between your fingers and throw the skin away. lol leftover peas from dinner would be fine as long as nothing has been added to them (salt, butter, etc.).