Marble Bristlenose breeding help please!!!!

today i purchased 3 marble bristlenoses from the LFS as i am trying to breed them after successfully breeding my albino bristlenose and common bristlenose the marble bristlenoses are about 3.5cm, none of them have bristles so im worried i got all females? or are they not sexually mature yet? if so what size are they usually sexually mature? and how long will it take them to reach this size?

any help is greatly appreciated

High winralove , I'd say your fish are to immature to spawn at the size of 3.5cm, that would make your fish approx 7-9 months old, I'd keep the anticipation levels down for at least another 12 months.

J