senegalus can get to 10"-12", so an albino should be able to get this big as well. But many with albino senegal has mentioned the same thing you did, and most seem to only get to 8"-10". shortbody ones stay even smaller. growth depends on many external factors as well as the individual fish. eg. oddball (member here) said he's had a couple out of 15 or so (if i recall correctly) that actually reach the 12" mark.