Even though Astatheros isn't completely accepted, it was very clear that those sandsifters didn't belong in the same genus as the midas complex ... My guess of lyonsi being the smallest remaining Amphilophus at 8-10" is going on the theory that the sandsifters are most deffinately in another genus, weither it's Astatheros or something new. At the moment Astatheros is valid for the sandsifters, though it might change so they shouldn't be lumped as Amphilophus atm.