my fish wants to have babies

It's making a bubble nest. At first I thought something was wrong, I just changed his water 2 days ago. Last night he had a bubble in his mouth and I was like well that's weird. today I woke up to see bubbles in one secluded part of his tank and I was like wtf? I thought something was wrong with the water or the fish. He's just blowing bubbles and taking them to the nest. So I quickly learned through google that it's a bubble nest, they do it even when they don't have a mate. He is a single man okay. No ladies around town. But he's making a spot for babies. 

It says they finish their bubble nests within 2-3 days. 

Okay, what do I do when he's done with it?? Just leave it? I have to change his water every few days. I don't know if messing up his nest is going to like stress him out or something.