From my photos, here is the meristic data i gathered. Its not an accurate way of counting them, but its better than nothing.
Lateral line Scale Count 26-30 (was difficult to count because of photo quality.
Here are the photos i used to get these numbers:
Dorsal - Easily can count the hard ray spines
Another Dorsal from different angle
Rear end of dorsal - you can count soft fin rays here
Lateral Line - I did my best to outline the lateral line so it was easier to see.
I forgot to adjust a pic for the anal fin. oh well. You get the idea.
According to the information on Geophagus brasiliensis i have, this data falls within the range of G. brasiliensis. But thats not to say that is what it is. I can't rule other things out without knowing the data of those species. Does anyone have the data for Gymnogeophagus meridionalis, G. rhabdotus. And also the data for Geophagus iporangensis, and G. itapicuruensis. And for anything else this could possibly be.
EDIT: was looking at more pics of geophagus, possibly Geophagus obscurus? It is very similar and has the dark blotches located under the dorsal as seen in my first set of pics.