Rinsing OK for empty tank that had previous cupramine treatment?

[MitchM]

Originally Posted by Chin_Lee

My experience with hobbyist: we r generally far too paranoid, overly cautious, overbuild, and take extraordinary steps for "precautionary" measures. ...

I agree, but I think that is because of (so far) mysterious failures that can kill corals that we have been trying hard/spending lots of money to raise and grow over many years.
I have never used copper or cupramine, but for a 30 gallon tank, it would be worth it to relegate it to some other use. A larger tank, maybe not so much.
Buying a new tank that size is probably on par with purchasing the various copper absorbing materials, test kits and required water changes.

Mitch