Just wanted to say thanks again for everyone's help. My little fish seem to be just fine. The two in the upper barrel seem to like to hang around the bubble stone. So maybe they did need more oxygen? Or maybe they like the extra bit of current and it makes them feel like a huge salmon swimming upstream!

I'll keep reading here and educating myself and someday when I'm ready for a bigger pond I'll (hopefully) be ready. For now, I have enough with these two-especially considering I have to figure out how to overwinter fish, snails and plants!!