Australoheros sp. red ceibal

So, I'm trying to get some information on these guys. I'm having a hard time finding reliable information on these guys. Anyone here have any experience with these guys?
I just ordered a group of 5 juveniles to go in my 75 gallon. They'll be sharing the tank with a group of 6 giant danios, a large pair of angelfish that will be moved when the ceibals get bigger, and a clown pleco and some BN plecos.

I know that they are a cooler water species. While the angels are in there I will keep the tank at about 74-75, when I remove them I might drop it down a few more degrees.

What I'm really wondering is about numbers. When they get bigger would it be better to keep just one pair or one male and a couple females or would a group of mixed genders coexist well? I'm just wondering about long term stocking of these guys.


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What about numbers and m/f ratio in a 75 gallon? Would it be best to keep just one pair when they get larger or 1 make and multiple females? Or can a group of mixed sexes coexist peacefully in a 75?


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I've got mine in with some giant danios right now. As of right now the giant danios are way too fast for the red ceibals. Do you think they'll be alright with them or am I going to start seeing fewer danios as the ceibals get bigger?

Here's a video of the fish that i did a couple days ago.
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Ok, so I've had these guys for a few weeks and I didn't think I would be able to sex them this early but there are some noticeable differences between them. I think what I have is 1 dominant male, one subdominant male, and two females. I have one that has gotten noticeably bigger than the other three. He also has a more pronounced forehead than the others. His colors aren't as striking though which from what I've seen, the female's colors tend to be more pronounced (am I wrong about this?). So, that one I'm assuming is the dominant male. I have another one that has the same color patterns as the one I assume to be the dominant male, but it doesn't have a pronounced forehead and is about the same size as the other two that I assume are females. I'm assuming that's just a subdominant male. I have two that are smaller but their colors are significantly darker and they've also developed a dark blue to almost black color under their chin which gets darker when they're interacting with each other. I'm assuming these are females. I've got a couple pictures of the ones that I think are females. Someone please help me out and let me know if I'm on the right track or not. Thanks.

Here's a quick video I shot of them.

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