I know there are two types of Black Nasties, but I can't tell which types this one is. If anyone know please tell me. 
What type of Black Nasty is this one?
- Thread starter Cichlids keeper
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I'm no expert on them but as far as I know there's only one kind and that's Nandopsis haitiensis which is what I believe is pictured in your OP. They do have more then one common name though Odo, Black Nasty and Haitan cichlid. Though perhaps some people confuse them with Nandopsis tetracanthus the Cuban Cichlid.
That's what I thought which led me to my dickish "its a male" answer. And I do apologize late night taking care of sick family
I didn't think there was anything wrong with your answer. Since I was unaware of any other Black Nasty I also thought it might be a question of the OP wanting to know the sex. And I hope your family gets well as soon as possible.
There are two different types as far I as know. Here are pics of them
They are both males but I can't tell which type the original falls into because it doesn't have the nuchal hump but it doesn't have the same pattern as the one with a black face.
Btw as far as I know there is only 1 specie of black nasty. The 2 pics ya posted are of the same specie just with a slight variation in color. Also some males grow a kok while others do not. It mainly has to do with genetics on whether one will grow a kok or not.
At one point there was also N. vombergae, but this has since been disputed.
It just happened that the individuals collected were older and had longer fins that the original fish collected, so thought to be a different species. Although there may be slight location differences from river to river depending on dissimilarity of habitat.
My male from years ago.
female
Their colors can vary quite a bit depending on color of substrate, if housed with no other haitiensus or not, or light conditions.
Below same male as above
Below same female as above, without a male in the tank.
another shot, of the same male below
It just happened that the individuals collected were older and had longer fins that the original fish collected, so thought to be a different species. Although there may be slight location differences from river to river depending on dissimilarity of habitat.
My male from years ago.
female
Their colors can vary quite a bit depending on color of substrate, if housed with no other haitiensus or not, or light conditions.
Below same male as above
Below same female as above, without a male in the tank.
another shot, of the same male below
