Here's a couple pics of a male Ancistrus, uncertain of the species, but I have 2 pairs of them. Females are only about half as big, and look quite like common BN. The males, obviously, grow a bit larger than the regular variety. They're great for algae cleanup, the 75 was badly overgrown when they were introduced. They had the glass cleaned off in about 4-5 days, and have kept it spotless ever since.
