Well it definitely isn't an A. heckelii, and I've never heard of a "presilency".
As for info, Geophagus are typical American Cichlids.
They like a small gravel or sand substrate and plenty of driftwood. They're Omnivorous, so they'll eat basically anything, I'd recommend a staple diet of quality cichlid pellets that contain both meat and vegetable matter, mixed in with treats or servings of vegetables like Peas, Cucumber, Pumpkin and Zucchini, as well as meat based products like Beef heart and Blood worms. They'll also eat insects and earthworms if you have them on hand.
pH shouldn't really matter as long as it's not too high, anything from 6-7.5 should be fine. Sexing is generally quite easy as they grow larger. Males will usually be bigger with very long extensions on the tips of their dorsal, caudal and pectoral fins, and have more pronounced colouration. Females will also get the extensions but males will be longer.
As for yours, the more I look at them I think they're Geophagus altifrons.