If you want to keep everyone then youll need 2 more tanks at least a 75 gallon for the devil. Then i would say get a 6' 125 for the green terror, jd and cons, add some larger schooling fish with them. Leave the firemouths in the 55. From my experience this should keep everyone happy. Just realize these changes will have to be made sooner rather than later it will not take long for that devil to cause chaos.
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