FSM;2041196; said:A 12 inch fish shouldn't be in a 12 inch wide tank.
I generally agree with that statement. However, I have never seen a 12 inch JD. Most males top out at 10-11 inches and females at 8-10 inches. My breeding pair I purchased recently was raised in a 55 gallon for nearly 3 years and they are both about 10 inches (I have never seen a female this big) and very healthy. In my opinion a 55 is perfect for a breeding pair. This is what it produced for me (now moved to my 210)...

