I think you and I are contemporaries. I can remember back in Queens NY, WAY before the national chains took over, that my local mom and pop pet shop had actual bath tubs (the kind with claw legs) out back. I never actually saw what was in them, but I'm pretty sure they weren't empty. I think it may have been what inspired me to start my own porcelain "tub" many years later.Back in the early 60s when I was kid living in Kansas, there was woman who had a small fish shop in the garage on her farm at the edge of our suburb. She used old enameled steel liners of refrigerators with the holes plugged. They sat on sawhorses under the big elm tree. They were stuffed with stem plants and she bred livebearers in them every summer. She then sold them in the shop during the winter.