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I agree with Frank. The 1st 2 photos show a male brevis-group species, but I'm not certain that it is A. brevis, which should show a dark anal spot. It could be a young A. personata? Time will tell if the dorsal fin develops. The 3rd looks like a young male A. elizabethae to me, too.
Looking at your conductivity (263 µS/cm) and total hardness (36 ppm) I would call this water moderately soft. Looking at the beer brewing Ca hardness (14 ppm) I believe that about half of the total hardness is from carbonate hardness. I'll leave the water experts to correct me if I am wrong.
Several species have been found in the upper Xingu drainage recently, like A. kullanderi, A. flavipenduncula, and A. eleutheria, along with forms of A. taeniata-like species from the Rio Curuá, a tributary of the Rio Iriri. Interestingly most of these fish were found by survey teams evaluating...
IMHO the Belo Monte dam has affected ornamental fish collecting in the area. We see occasional species from the lower Xingu like A. cf. agassizii and A. sp. Xingu, but we don't see species that were collected from the area around Altamira. Two that I once had were A. sp. Blauspiegel (A 230), an...
This is typical cichlid territorial aggression. You have them in too small/open tank right now. You could remove the most aggressive fish, but the next most dominant fish would take its place as aggressor.
The I. bimaculata have 2 benefits with regard to successful reproduction. They are in a large aquarium that is decently aquascaped and the pair will both defend the area around the fry. If they succeed, great. If not, I'd house them in a separate breeding tank.
From experience: if the fish come in, in really bad shape - breathing heavily and gasping at the top of the bag - just throw them into a quarantine tank without acclimation. Most wholesalers do this - and hope for the best. Otherwise I use a slow drip method.