If you and your father like greenterrors then one alone in the 55 gallon tank would be fine, I suggest going with that option.
I have a male jd in a 55 by himself and if I get near the tank mine will crash into the glass, break the heater, the hood, etc. He crashes into everything out of fear. Does your gt do that also? Or does he attack the glass because hes a badass? I wish my jd wasn't such a wussfishbum;3564037; said:I have a single GT in a 55. He loves to hit the glass.And he does it anytime anyone gets within 3 feet of his tank.

I knew I should have gotten a gt. I'm jealous.fishbum;3564183; said:No,my GT is on the glass because he's aggressive.He runs his head into it with his gills flared,and mouth open,biting at the glass. He's bitten me before.
