Yes, I would add a few pounds of fathead minnows (just to be sure, not 'flat' head minnows).

You could also introduce Bluegill, but I wanted to ask what you think the surface area is of the 1-3' deep water. If it's not even a 1/10 of an acre, I might wait another few weeks for rain. If it is that small right now, maybe stock a lesser amount of Bluegill now and more after you get more water.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."