I haven't kept the two species together yet. I plan to do that once I grow them out a bit more. Rusty Wessel has mentioned that they exist together in nature and are in quite large numbers. So I plan to have say 7-10 of each in the tank along with a couple of other species of cichlids. Also, I would like to find some nice swordtails to keep with them since they are present in the natural biotope as well. Here's a portion of an article written by Juan Miguel Artigas Azas on the CRC forum.
Thorichthys pasionis tends to live in extremely high densities in the lagoons within its natural range, and although normally outnumbered by Thorichthys meeki, it is a plentiful species as well. A throw of a casting net at the shores of the lagoons where it inhabits often produces an incredible number of both Thorichthys species, plus many other fish, cichlids and non-cichlids. The densities in which these fish live in the wild always amaze me. In the aquarium I have observed that a good number of specimens do fairly well, as they tend to establish small territories and live happily with it. Pairs establish their territory marks with any object present in the aquarium in as little as 30 centimeters square. A good amount of interaction is constantly present, but rarely is any fish injured. The interaction among Thorichthys pasionis pairs is normally limited to facing each other, making small frontal runs in which the individuals put their gill covers forward and extend their gular pouches (which in the case of the yellow meeki are of an attractive black coloration) in an attempt to intimidate each other. For this purpose as the gill covers are projected forward, their black subopercular blotches or "eyespots" separate resembling eyes more widely placed. After a brief advance pair retrocede and repeat this behavior a few times before returning to their respective territories. In this regard they behave much like their cousin the firemouth, in which Radeater and Ferro (1979) have studied this behavior with the aforementioned conclusions.
"The only reason for time is so that everything doesn't happen at once"
Last edited by notho2000; 03-05-2013 at 9:05 PM.