Right now, I'd be spending more time thinking about the plants for your pond than the fish. The pond is low and this is a good time of year to put them in. I think getting the right plants established can be trickier and more difficult than the fish. Also, if you have a foot or more of water in the pond and you're not worried about it going dry before it fills, I think you could start adding your forage fish now. When I built my new pond, I added all the fish species I wanted as soon as I could get them, and that was while the pond was still filling, and that worked out well. Maybe I was just lucky. What I didn't think about and never got established were plants.