[scolley]

Anti-Pjerrot - I'd say wait at least 48 hours after your last seam is made. That's if it is curing in at least 50% humidity. Otherwise, wait a just one day and then put some water in the bottom of the tank (1" or 2") to help raise the humidity in the tank. No firm answers here that I know (maybe someone else does???) but if the humidity is lower, you need to wait longer.

Bob Bob - for bulkheads just make sure you have non-tempered glass for the bottom (as with the sides), and have holes drilled by the glass cutters. You can do it yourself if you buy an expensive diamond glass bit and drill it. But I chose not to risk that.

Then you just go to any saltwater aquarium store (on-line!) and get a bulkhead kit. It will have all the plastic parts you need in a single kit to screw on a fitting that has attachments on the inside and outside. The decision you have to make before you buy the kit is do you want slip or threaded fittings - making that decision for both inside and outside. I got threaded for both myself.