Dont see why not aslong as the convicts are not a breeding pair you shouldnt have any issues, like already stated all depends on the fish itself aswell 

I have three jack Dempseys with about 15 convicts right now in the same tank.
I've kept more than THAT in a 29g.....Hey everyone, I guarntee this question has been beaten to the ground, but I have a 29 gallon tank ( yes I am aware they will grow out of it, please refrain from rolling your eyes at me, I know they need there space and will be upgrading to a 95 gallon eventually. Can my 2 convicts live with the jack demp? They are all about 1" right now, my tank has lots of hiding places, medium lighting, and lots of mechanical and biological filtration, I have had tropical community fish for years, and goldfish since I cant remember, but I am new to south american cichlids, any tips, helpful hints? I have them on a flake diet, im going to switch them onto a sinking pellet/occasionally supplemented diet. I read somewhere about having to have lots of fish so they dont get overly aggressive, any truth to this? Thanks View attachment 814727View attachment 814728View attachment 814729View attachment 814730
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Two of a gender is what he should be aiming for, espicially males... They get big enough to hold their own and wont breed together...Show us better pics of the cons of they're two males or two females you might have an issue.