JD's usually top out around 8-10". As for the false Green Terror (Gold Saum), they usually max out around 10". Although there are plenty of males out there around 11-12", the norm seems to be around the 10" mark. In addition, both of these species take considerably longer to reach adult/max size.
I've seen a 12" Jack Dempsey. So I would assume the max size for each is about 12".
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JD's usually top out around 8-10". As for the false Green Terror (Gold Saum), they usually max out around 10". Although there are plenty of males out there around 11-12", the norm seems to be around the 10" mark. In addition, both of these species take considerably longer to reach adult/max size.