I needed some way to hold the end of the stream up, and to close off the end, so the water goes where I want it to. It is also going to help hide the water line.
I'm concerned that once the salamander gets in there and digging then he will knock it over. I think that I'll have to attach the side of the upright to the side of the tank.
Do you think that great stuff white foam will be fine for the salamander, if I cover it with coco-bark?
Yes, I'm sure it will. You might also think about cutting the top off, and doing something like placing a rock on top of it or something.