I'd say they have to be around 3 inches. I've heard male bristle nose grow the bristles all around ( lips up to their nose) and females have fewer or none and only around the lips. Males typically are larger also.. Yes they can still breed being an albino is just a recessive gene. There comes alot of things you have to do to be able to breed. Here's a good link
As for driftwood what we dd was go down to the river and find some. I don't think you can just make it.. You'd have to water log it then let it dry in the sun without rotting? Not sure. But if you do collect pieces run it through the dish washer without soap. We also had to drill stainless steel screws with granite pieces we got from some stone working place to anchor it down. Hope I helped a bit!