IMO a trimac and hatiensis grow too large to be housed in a 75.
But since you said you would upgrade a hatiensis or trimac would be nice in a 125-180 gallon tank. Since you are upgrading I would keep the grammodes in the 75. A pair of Grammodes get a little large for a 55 IMO.
But since you said you would upgrade a hatiensis or trimac would be nice in a 125-180 gallon tank. Since you are upgrading I would keep the grammodes in the 75. A pair of Grammodes get a little large for a 55 IMO.