I've just noticed the part in your post about Nosferatu bartoni.
I have kept them and they have spawned for me, and are a great cichlid to keep, given enough room.
They are fairly aggressive, from Mexico, and do well at normal aquarium temps. Sometimes in their natural area water temp gets quite cool (mid 60sF), and often found with Herichthys carpintus.
below a male

now a female

although a small cichlid, I kept my pair in a 100 gal tank, when I gave the pair to a friend he put them in a 55 gal, and the female was immediately killed.
they both make excellent parents, tending the fry for an extended period

in my 100, six foot gal, they spawned on one end of the tank, while a pair of African Lepidiolamprologus spawned on the other side, and at times the fry would commingle.
Probably wouldn't happen that way in a smaller tank