How Many

I seriously doubt you will have any problems with multiple pairs in a 100g. IMO, 3 pairs of Nigrofasciatus along with some other fish will be a nice setup.

I think it would interesting to start off with 10+ nice wild fish and form a colony. This is something I want to do. Hopefully I can find some nice wild ones at the cichlid convention this year. I plan to keep mine in a 125g with Striped Midas though.

Good luck
 
i doubt you could have more than 2 pairs in that 100g. convicts are jsut too destructive when their breeding, they would cause all hell to break lose in the tank.
 
I agree convicts are called convicts not only for there stripes but because if they did what they do and they were human then they would be convicts on death row in pelican bay. Convicts get to agressive during the mating process even in a 100gal. you might be able to get way with 2 pairs but I wouldnt risk it. I would also go with one male and several female. If its color you want just get some pink convicts regular convicts and calico convicts. All same fish just differant morphs.
 
I think you guys are being extremely conservative. I currently have 6 subadult convicts in a 125g, along with several other cichlids, and there are no problems. Convicts don't just kill for fun, they kill over territory. A 100g should be plenty of territory for several pairs.
 
You just solved why they get along. One you have a bigger tank and 2 yours are sub adults as they grow they need more territory and that means more conflicts and more injured fish. What other fish do you have with yours in you 100+ tank.
 
I would not recommend Cons for your tank for one reason, which has not yet been mentioned: it is fully planted. Central American cichlids are diggers (especially when breeding), and the Con is not even close to being an exception.

Could you fit three pairs of adults in there? Yes, as long as a few territorial markers or some target fish would be in there with the Cons, but I would not do it if you enjoy the lush plant growth.
 
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