You shouldn't have to add any o-rings when dealing with pipe threads
This can lead to failures down the road
The 2 best options for connections outside your tank are threaded or slip. This does not include union style connectors
Threaded you use tape, or better is to use liquid teflon (thread sealant). Slip you glue.
Nothing else is needed if it's done properly
Maybe someone living close to you could come by and look over your stuff/give you some help tips etc
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