I don't want to scare you, but you only have about 1" left until your Cuban cichlid morphs into a homicidal juggernaut killing all of its tankmates regardless of their size. I had to remove a 5" Cuban Cichlid from my aggressive cichlid tank. It beat the crap out of a larger ~6" Dovi, similar sized Jaguar, 10" Buttikoferi Tilapia and four 12"+ Nile Tilapia so bad that it was obvious that it was "creating" its own species tank.
I bought a 1.5" Cuban to growout to hopefully keep the other Cuban in the species tank. I figured that it was safe to keep it growing out with a 8" golden red-spotted severum, a 6" red-headed severum and a 5" Polleni Tilapia. It killed the bigger severum within a week, started immediatly on the next severum & Polleni which I am now treating with melafix. Prep yourself for a brusier! I would not dream of allowing this little killer be in a tank in the same room with my 6+' EBJD in my avatar.
I agree with another poster. Freezer for the kisser. I always try to make the best of the situation. Keep telling yourself that it was just a "slightly pricey" feeder, but that your pets are worth it!