Prefers small home

[Sarada]

So I got Moe the betta from my LPS...when he was in his little bowl in the store...he had a big bubble nest...brought him home and put him in a 5 gallon tank...no nest for the two weeks I've had him.

Yesterday I moved him to his hospital tank to treat some fin damage...bubble nest over night...

[kuklachica]

Is there a filter in the 5 gallon?

[1fish2fish]

Bubble nesting is an instinct, it shows nothing more than reproductive readiness. There could be several reasons why the fish didn't make a bubble nest in the bigger tank.

[Sarada]

He did have a sponge filter in it.