Whatever they are, I'm very happy because one pair seems to be preparing for spawn!
Not very strong bond yet, but male has taken half of the 180cm tank as his territory, and female (the most colorful fish out of three smallest ones, so probably a female) visits him from time to time. Sometimes he shakes allover his body in front of her, sometimes chase her away. I'm sooo excited, those are my first Geo's and I didn't expect a lot from young fish. Anyway, fingers crossed
One observation, as Geophagus-beginner: to me, it'd be better when they won't become G. altifrons. They are still quite small (largest A-male is around 12cm i think, little bit bigger than I thought eralier) but 180cm is not too loooong for them. I mean, incredibly active fish! Maybe when they get older they will be more "static", but for now 7 subadults specimens is even too much for my tank.