safe for qt?

[featherblue]

I've never built the plumbing for my tanks, so I have no pvc running around to put into my QT for caves. I've got a few options, but imn not sure which would be best.
option 1: solid glass coffee cups, old school cups, stamped france
option 2: "catfish cave" from old project. appears to be ceramic with solid glaze coat
option 3: plastic down tube for replacing sink drain
would any be a good alternative?

 

[Crabs McJones]

I've never built the plumbing for my tanks, so I have no pvc running around to put into my QT for caves. I've got a few options, but imn not sure which would be best.
option 1: solid glass coffee cups, old school cups, stamped france
option 2: "catfish cave" from old project. appears to be ceramic with solid glaze coat
option 3: plastic down tube for replacing sink drain
would any be a good alternative?

Was the sink drain pipe ever used? If not that'd work good

 

[featherblue]

never used, was not the correct part for it's project and just never got returned.
being for a drain will it still be a plastic that won't degrade in sw? or absorb meds?