I'm so confused!
I have two male bettas in two separate tanks..
One is very active. He swims a ton, eats his food within minutes and is just all around very healthy.
The other is more of a slow swimmer, often leaves some food after eating and seems pretty laid back.
The slower, less active fish made a bubble nest a couple days ago and I'm not sure why. There's no way he can see the other fish, so I'm absolutely puzzled. I've never seen any other bettas I've owned making bubble nests.
Any idea why?