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First, Cruzeiro do Sul is located on the upper Rio Jurua. The Rio Moa, a tributary of the Jurua, is the type locality for A. moae. So that part seems ok. However all 'typical' eunotus-subcomplex species (= noticable split vertical bar(s) on caudal peduncle) are found in tributaries of the Rio...
It seems, from your description of their color, that the could be A. cf. eunotus (Orangeschwanz). This species is found around Iquitos, Peru and matches what you have described.
There are dozens of N. marginatus populations (probably different species). Take a look at TomC's site: https://www.tomc.no/fish.aspx?fishIndexID=1805&gruppeID=5.
30°C/86°F is ok for this species. They came from the Llanos of Colombia and Venezuela originally and have adapted to higher temperatures. Other than that I think MacZ (post above) is correct in all respects. Your fish might not be fully grown but they appear to be sexually mature. My guess is...
You realize that commercially bred Rams tend to be 'overly delicate'? My preference is wildcaught specimens. Not a pretty as juveniles but they do color up as adults.
It is just a manner of showing completeness. For some water sources it is more important than others, especially if one is interested in keeping breeding. pH is important for fish from hard water sources like those from rift lakes in Africa compared to softwater species like apistos.
Changes in color pattern are a method in communication in many cichlids. Most are visually oriented. The change can indicate dominance or breeding desire.
Compared to how fish live in the wild your 65 is tiny. Single male apistos will protect territories (depending on structure) much larger than your tank. Of course some species are less territorial than others and in the dry season, with receding water, will inhabit much smaller areas. Some are...
It is an unusual species phylogenetically. I've never known them to be imported commercially. Not a spectacularly colored species; kind of looks like a bland A. cacatuoides to me.
There are 500+ species/forms of apistos out there and they do not behave the same. A. borellii is a mellow species and panduro is more aggressive. Add to that realize that borellii is a maternal brooder where the male has little interest in his progeny while panduro form breeding pairs that...
No, those are only blue stripes below the preorbital stripe on a typical red morph of A. elizabethae. The Icana form shows blue and red stripes below the preorbital stripe. Reid's fish is a good looking fish however, most likely from the Rio Uaupes.
Probably Hyphessobrycon guyanensis from French Guiana. I know nothing about the species. The other possible is Holopristis guyanensis, which was previously listed as Hemmigrammus guyanensis.
Yes, like that one but the stripes on the face are more blue and red horizontally striped. Actual photos of the Icana form are rare. I only know of 3. Matsuzaka 1996 shows a young male photographed by Sasaki and the DATZ book has a couple of photos by Koslowski.
If they are juveniles I'm afraid that will be nearly impossible. They should all look about the same. Depending on their size/age males tend to be the more aggressive and a bit larger - but not always.
The only A. elizabethae that I would presently think about keeping is the form from the Rio Içana; a spectacular color variety. I guess after all of these years keeping apistos I've become a bit jaded.
Most books published on dwarfs discuss them. They do belong to the bitaeniata-group but in a different complex from the many forms of A. bitaeniata. Behavior-wise they are very similar to these forms. Coming from the Rio Negro they are a blackwater species and are regularly reproduced by...