I'm glad that I could help with at least that. I'm very sorry for your loss.
I just read back into your post a bit, and I want to comment on that feed. That is perfect fine to feed ducklings, but you will want to add niacin to it. You can use Nutritional yeast for that. About 1 tbsp per cup of feed. Either that or get a flock raiser crumble which already contains niacin.

Also, a huge pat on the back for taking this venture on. You are doing a great job. Are you prepared for when they get bigger and need a coop and run? Probably not yet, but its never a bad idea to start planning your future setup. The BYC articles pages has SO many article with fantastic coops if you need some inspiration. Or you can post a thread in the coop forum on this site, and we can give you some suggestions.