This is a discussion on Black phantom tetra breeding? within the Fish Breeding forums, part of the Freshwater Fish and Aquariums category; -->
I have 3 black phantoms, and 1 red phantom, and i was thinking of breeding it. However, i have no idea how to sex ...
Black Phantom and Red Phantom Tetra are both schooling fish. They require a group of at least 6 (so that would be 6 BPT and 6 RPT) so that they can live longer, healthier lives. Haveing them in numbers smaller than this stresses the fish, shortens there lifespan, and makes it more likely for them to get a contagious diesase.
Not trying to scare you or scold you, just want you to know how important it is.
The male Black Phantom Tetras have longer fins than the females and when in breeding condition, the females become plumper, but the biggest difference is in their colour. The males have almost no red, while the smaller fins of the female both on the top and underneath them are red. The adipose fin, on the top of the body behind the larger dorsal fin is much more noticeable in the females than the males, because in females it is red while in the males it is grey. When the fish are in breeding condition, the colours of both sexes become more distinct, with the male showing its black fins more obviously. This reply was copied from the Black-Phantom Fact Sheet at Black Phantom Tetra Fact Sheet.