Do all BNP stay on the small side?

Just wondering for future reference (in case we decide to get other colors/LF in the future) - do all BNP stay small (ie 4-6 inches)?

I've had friends/family that have bought plecos (not BN) from the pet store and ended up with 12 inch monsters that show no sign of stopping.

Thanks!

All bristlenose (Ancistrus) stay on the small side around 4-6 inches. There are a few that get may get slightly bigger. I've heard of male Peppermints getting up to the 17ish cm mark which is nearly 7 inches and they get alot bulkier too. Longfins may look a bit larger because of their long fins but their body lengths will be the same as their shortfin counterparts. So as long as you're sure that they are a bristlenose you should be fine.

Thanks! Will keep that in mind!

yeah, you often get the stupid pet shop owner who doesnt know a pleco from a bristlenose and you end up with horror stories like 30cm plecos in 40cm tanks.