I agree that the devil will kill any other fish in the tank, and the 55 gallon is too small.
I currently have had my Jag for 4.5 years and he cannot tolerate anything (and he's in a 92 gallon tank). When he was a juvie, I tried 3 giant danios, and soon enough they disappeared. Then I tried some young pictus cats that were more than half his size....and to my horror, I watch one get attacked and mutilated.
Needless to say, you have an aggressive cich that is currently in a tank that he/she will outgrow. Nothing will last long in the water with that devil.
I currently have had my Jag for 4.5 years and he cannot tolerate anything (and he's in a 92 gallon tank). When he was a juvie, I tried 3 giant danios, and soon enough they disappeared. Then I tried some young pictus cats that were more than half his size....and to my horror, I watch one get attacked and mutilated.
Needless to say, you have an aggressive cich that is currently in a tank that he/she will outgrow. Nothing will last long in the water with that devil.