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I'm not going to say it's impossible because I'm sure that someone has made it or will make it work with the proper amount of plants, wood and stones, but I personal wouldn't try it especially if you intend to breed them. I keep a trio of Cacatuoides in a 50 breeder and each female take an end for territory with the male in the middle. The female aggressively defend their territories from each other. Just my experience though.
I had an A Agassizi pair and A Cacatouides pair in a 55 heavily planted tank with dithers and it was a continous battle. I now have them in separate tanks, but wish to keep more than one pair in each tank. I would like for others to elaborate on Bob's post so I may learn also.
It really depends on the species to be kept together and the manner in which the aquarium is decorated. Trios of the smaller species of the regani- & pertensis-groups, as well as A. wapisana & A. borellii should be able to co-habit a 50 gallon breeder tank - if the tank is properly decorated with line-of-sight in all directions being broken by dense clusters of plants, driftwood, and other decorations.
Your tank probably is too small for other, more territorial species - especially if the tank is fairly open.
Sorry for writing here but I haven't found a proper topic (and don't want to start one, so pls move this if needed). I'd like to know what other fish do live in the natural habitat where Apistos exist?
Thank you. I'm thinking of providing them perfect tankmates. Where could I learn more about Apisto's natural habitat (other fish, environment, pictures, etc.)? What is a pyrrhulinid?
Most book on dwarf cichlids have a description of their biotopes. On the web, Tom Christoffersen (http://apisto.sites.no/default.aspx) has some very good articles, with photos, about collecting apistos in Peru.
Pyrrhulinids include species of the genera Copeina, Copella, and Pyrrhulina. They are closely related to pencilfish; some hobbyist consider them just another kind of pencilfish.