when do bristlenose pleco get their bristles
Report Abuse. Male Bristlenose Plecos will get their bristles when they reach sexual maturity (about 2-3 years old, and 7-8 cm/ 3) male albino bristlenose plecos will probably grow larger bristles than a regular a bristlenose. and females will have none to very few bristle around the chin and lip. Jake Â· 5 months ago. Thumbs up.