I think they get 8-9" if I remember right, not many ask about them!
And Taeniacara was an acara subfamily, not Geophagine much like Guinacara was. But Kullander, after first moving Guinacara out of the Geophagine and putting them in Acara, has now with DNA reversed this and they are back in Geophagine. I haven't seen any studies on Taeniacara DNA yet, but they weren't listed in a recent work up combining and reassigning various cichlasomines and acaras.