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I don't know buit my guess is that males may reach 7cm.
Can very well be the case, especially for A. uaupesi and A. elizabethae: their type-localities are in the very same river merely a few hundred meters apart from each other. The type-locality of A. brevis is in a different river, but merely...
Here are some pictures:
https://www.aqualog.de/en/lexikon/apistogramma-brevis-4/
https://www.aquaportail.com/especies/ficha/pez/3482/apistogramma-brevis
https://fishbase.mnhn.fr/photos/ThumbnailsSummary.php?ID=46595
The two supposed fenales show a distinct gap between lateral band and caudal spot. I haven't seen this in any elizabethae so far. Imo they are likely a different species.
Among other things A. sp. Steel blue have a vertically extended caudal spot that is separate from the lateral band, these fish don't - they are 100% sure borellii.
In most cases the only way to safely distinguish hoignei- and macmasteri-subcomplex females is by means of the black markings on throat, chin and chest when they are in spawning/brooding mood. Most hoignei-subcomplex females show black markings on throat and chin whereas most...
See here: https://www.tomc.no/page.aspx?PageID=116#A.-macmasteri-Subcomplex
Howver, depending on how small your fish are, it might be impossible to tell yet.