Madtom1:

Madtom2:

Madtom3:

Madtom4:

Madtom5:

showing its a female (atleast from what I read...)

Madtom6:

showing off its a male (once again based on what I have read..)

I am thinking (didn't attempt to sex them all) but madtoms 2,4,and 5 seem to be gravid (IMO) and I would then guess fishes 3,6 to be males. Fish 1 I think is still way to small, but time will tell.
Showing them all in the bucket waiting to be photographed:


hope you enjoy the pictures as much as I enjoy the fish!