#1 - ? need to see the caudal marking
#2 - Geophagus pellegrini
#3 - Geophagus argyrostictus
#4 - Satanoperca leucosticta (most likely) however it could be Satanoperca mapiritensis as it has the correct muzzle spangling and lack of spotting on the flanks, specifically under the dorsal. My only hesitation is nuchal shape but that can go either way IME. I an more inclined to believe it to be Satanoperca mapiritensis, although less likely. It is one or the other between the two species though, that is for certain.
Any idea on collection points? That helps narrow things down much more so that just visual confirmation.