My advise would be to go with a smaller CA cichlid like Convicts or Sajicas where a hides can be created for them to retreat to when things get a little crazy. I would go as far as to even reconsider keeping the GT with the grammodes. Grammodes can be some really nasty fish and do some serious dammage. You didn't mention the tank size so it's tuff to be specific but considering the full grown size of the Grammodes, Chocolates and GT's it would need to be a pretty large tank for these fish to have sufficent space to claim terratory and stay out of each others way. If you end up with a breeding pair of Grammodes all bets are off. I would also add adult Chocolates are some stunningly beautiful fish and it's really an injustice to them to be used as target fish. Convicts and their like on the other hand are much tuffer, hard as nails and are much better suited for this roll, not to mention their smaller size actually helps there chances of survival if they are given places to hide that the grammodes can't get into.
