Leaky bulkhead help

[aquaantelope369]

I bought and moved a used 180g. I’m in the middle of set up, leak checking it. I filled the overflow to check the bulkheads. I have some bulkhead fittings that I just can’t get to stop leaking. They are very hard to access, I even bought a basin wrench to get on them. But they don’t seem to want to tighten or loosen, just spin (and leak). Does anyone have any advice or tips and tricks? Drain and emergency drain are 1.5inch, returns are 1inch.

 

[Submerge]

You are going to need to hold the white pvc still as you loosen the nuts. You could glue in a sacrificial pipe to get it low enough to hold it if needed.