You obviously care alot about them and are doing the right things! I don't think they are sick either, so the meds might be a bit of overkill at the moment.

BUT, it's great that you have them in case something happens! Keep us updated and I'd love to see their new home once you have it all built. ^-^
Thank you. They not only appear good, but better even. I guess they were too hot, and too wet. The moisture situation has changed drastically already. I slowly moved the light farther and farther away until I turned it off completely. Then I moved them out of the bathroom and we hung out in a bedroom, with the fan on. It's hot atm, around 80. They seem to love it, prefer it. I guess they grew out of 90 degrees..
They all seem healthy and happy. They've grown 'chests' I just noticed. They really have gotten a lot bigger. No way they'd fit in an egg. Three of them jumped/hopped over other ducks. All three were in a span of a minute. I've never seen them do that before.
I sort of ghetto'd there upgrade since I figure they'll be needing another one soon enough. I'm turning my greenhouse into a home for later but I'm going to make a medium house until I'm ready for them to stay outside. For a very short-term, ghetto upgrade I converted the bath. I put down plastic liner and bedding. I haven't actually put them in yet. I'm not completely convinced it'll work how it is. I get the feeling they're going to do their best to get between the tub and plastic and then I'll make sure they can't.
I've been hanging out with them to make sure they don't get cold and they're not. I probably should have realized they didn't need so much heat. When I take them outside they like to go in the shade. They have kind of have been sending me unclear signals but not moving closer/farther. But then again, they have also been impossible to keep dry.
Thanks for all the help everyone.
What a day. I saw it was 7:30p and I couldn't believe it. I have no idea where the day went. I'm still not completely sure what I actually think happened. Did their system just clear out? Was it one cold wet duck that died, while others had a heat issue? Other? I'm not sure, but I do know everything seems good now, and a duckling dying makes me wig-out.