Originally Posted by jadaBlu
. Maybe I will do that for this fish it should still grow BB.
Uh no! As the resident sponge filter expert, I can tell you that a sponge filter that isn't running is just an ornament.
Click the link in my signature to learn all about sponge filters.
The main thing is if your fish has a problem with a sponge filter it's usually because the air flow is too strong. A simple valve inserted into the air tubing allows you to adjust the rate to a level that isn't prohibitive.
I have sponge filters in everything from my 2.5 to my 5 to my 40. Used properly they are the best filtration for bettas!