they are really easy to breed....
heavily tainted water with low ph, and put a big piece of flat wood(I use bark) at the bottom.
they will lay eggs on the wood/bark, and dig several big hole on the substrate, once the eggs hatch, they will move the babies to the hole.
bred 5 times since I have them, every time a big cloud of babies fish but didn't intend to save, and all eaten by other fish in the tank, even the parents fiercely guarding the baby fish.
actually, I am not sure they are curvirceps or dorsigera, their belly are deep purplish red when the light is strong, especially in the morning when the sun light hit the fish tank through the window.