I'll tell you two things.
1) There is very little chance you will have a problem with the joints. It takes years and years before the bonds will break and more than likely you will have moved on to another tank or different plumbing.
2) I would still redo the plumbing just for peace of mind. As long as your tank is set up you will always have the fear that the plumbing is going to fail. The time and money spent to redo the plumbing is well worth that peace of mind.
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