The largest Jag has been getting aggressiver than the others. My aggressivest cichlid before the Jags is a 3" Furious Male Firemouth. It attacks everything. It was in my 100g with 3 smaller Rainbow cichlids, he was chasing the rainbows causing stress.
So i moved him to the 20g Jag tank just to see if that would work better. Well one of the Jags had been pushing the other jags around and showing constant aggressiveness since i got the jags.
When i put the FM in the tank he went straight ahead to check out the Jags, he started flaring with the Jag that had been more aggressive than the others and the Jag just went straight at him and gave the FM a good beating. Well i took the FM out as soon as that happened.
I think that agro Jag is a male and maybe even a future glass banger, or its just that he is the biggest of the Jags.