At Mikolji.com there is a good article on revision of the genus Apistogramma in the Orinoco basin. In Spanish. Other places on the site he has wonderful videos of Apistos and rams in their natural habitat as well as other fish and orchids. I have been to some of these same areas and collected guttata from the same spot as in his Rio Morichal Largo video. I can appreciate how hard he had to work to get these videos.