PVC pipe/rock structures

[superduperwesman]

Originally Posted by rocknroll

I'm wondering about the glue used to hold the pvc together? any problems with it breaking down, or being in any way toxic to the tank?

Then I think we're all in trouble because I'm pretty sure most use PVC/PVC glue to plumb there tanks... only difference is the outside of the pipe is wet too... would you even need glue??