I bought two at 1.5" last January and lost one of them after about 3/4 months. I had them in a 56g, but the one I have now was beating up the other one and growing way faster. I put this guy into the 265g at about 3" and the other just stopped eating if I remember correctly and died shortly later. I'm pretty sure they were both males. I also bought two Trimacs at the same time as the Grammodes, they ended up both being females!! Go figure.