That's an excellent source that I have overlooked. I'm still in the learning phase of tank making. More to come if I can manage to put together a reasonable prototype that would be of interest to the Board.
A good question. I very much doubt it is possible without supporting the inside of the tube (which would be hard or impossible to remove after bending). Narrow tubing such as that used for filter intakes and returns is possibly best made with glass since glass can take a good scrubbing without incurring scratches.