Container Water Garden project

[Samw]

I just picked up 2 half barrels for making a tub pond on my balcony. I need to get some liner to line the inside of it as I don't think I can find pre-formed liners for them. The plan is to stack the smaller barrel over the larger barrel and create a waterfall. I hope to use a battery backed up solar powered water pump and maybe add a battery backed up aerator as well. In the winter, I'll move the barrels into my apartment. I plan to stock the tub with small goldfish, mountain clouds, and water lilies.