cleaningbudgie

I have a question that I can’t seem to find online hoping someone could help me out. I was prescribed antibiotics for two parakeets after finding out one had a crop infection.Thankfully they seem to be doing better so far after 4 days but the medicine looks like it’s staining the feathers...

I don't really know if my budgie anus look normal or not. It's my first budgie. Is it normal to looks like that bumped out red, or something is wrong? He have lots of energy, if I open my box he climb immediately to reach for my hand and sleep under it, but when on his nest he keep sleeping. And...