New 75 gallon stocking help

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Yep. Be ready to get a bigger tank :). That oscar is going to get big. It can get up to a foot long if not larger. Pretty much you need other medium to large fish that the Oscar can't eat or bully to death. Maybe some green terrors or a bottom feeder like a pleco. I looked up some other common tankmates and they are fire mouth cichlid, convict cichlids,severum cichlids.
 
The Oscar and the JD get about the same size. I think you'd be ok having one of each in a 75g. My suggestion would be to change out 50% of the water weekly, increase filtration, and watch for aggression as they grow up.
 
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