Would be happy to see a bubble nest for the first time in my life in my own aquarium :). But the prob is he gave up doing that. No floating bubble yet. I googled about bubble nest and found that they need plan which I dont have :(. Can they make bubble nest without any plant ?
If there's a current in your tank and no plants to hold the bubbles in place, then the chance of a proper bubble nest forming is pretty slim. He'll just blow the bubbles and they'll float away individually. I've seen a betta get a pretty good start on a bubble nest in a bowl with no current and no plants though.