Air Bubbles Under Filter And On Tank Cover

[Pb604]

How does a betta with 2 peppered corydoras sound?

 

[Blondielovesfish]

Corys are schooling species that like to be in groups of at least 6.
 
TBH, I would just have him with a mystery snail or a nerite or some shrimp.
 
You could have 6 Pygmy Corys, though you need a backup plan in case it doesn't work.