Haha none of my current males have built a bubble nest since I've owned them. One of my did have a brief attempt at making one when I moved the paper out from between his tank and one of my female's, and one built a nest when one of my females jumped the divider into his side and he thought he might get lucky.
Mine just spend their time swimming around, or wiggling into places they shouldn't. Though one of my previous males would make huge bubble nests, right before I was due to change his water. I used to scoop it out and then gently put it back in once I was done so that I didn't destroy his hard work.