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That is the first photo I've seen of the D. sp. "Tapajos", and I was amazed because the only other time I've seen that species was more than 30 years ago. The photo below was taken in 1974 at a friend's house, Mr. Ralph Anderson, who was an extraordinary fish breeder. However, he only got males, as seen in the crappy photo below:
A short time later I saw the same fish in Detroit, at the home of Mr. James K. Langhammer, and learned that he had bred them. Unfortunately, they only spawned once and only a few females were surviving, having killed off the lone male. Having just seen males at Ralph's house, I arranged a swap, but it did no good, as neither of them had any subsequent success. Bear in mind, these were two of the greatest hobbyist breeders of the time, and both had already bred small "Crenicara" species prior to this.
Never thought I'd see them again. I hope you have success in breeding these fish. I'll be looking for some myself as soon as I have an income again.
I kept them some years ago. At that time they also where imported under the name Dicrossus sp. "Itaituba".
They bred in soft, peat filtered water with a pH around 5 or a little bit lower.
Here you see a female with 85 eggs on an oak leaf:
Very smart place to deposit the eggs; after I several times disturbed her by approaching very close with my camera, she just pulled the leaf with the eggs further back in the tank and out of sight for me.
This species seems to have a very strong "biological clock"; the wild fish only spawned the second week of May every year. When the offspring grew up, they spawned the second week of May and the second week of October!