How big do bristlenosed catfish get?

[once i was a maggot]

you already know my question, could anyone answer it plz, and if anyone knows , would a bristle nose do well with about 4 female bettas?
thanx in advance

 

[Phantom Thief]

About 4-5 inches.

How big is the tank? There shouldn't be any problems though.

P.T.

 

[once i was a maggot]

the tank is 15 gallons
thanx 4 the help