Join Date: Oct 2010
Location: Victoria, Australia
I probably wouldn't house them with your B. imbellis. I have never kept this species of Killifish so can't help with the sexing of them, but I have read that they can be quite aggressive. Killifish will also eat whatever fits in their very large mouths.
I personally wouldn't mix Killifish and bubblenesting species of betta. They're better kept with the more peaceful species of mouthbrooders, such as B. channoides and B. albimarginata.
Killifish are also adept jumpers, having evolved to move from one body of water to another. So a tight-fitting lid is also a must with them.