Servums and Green terror

Depends on how you feed them. I think the Severums will grow a little bit slower in the same conditions.

Actually, depends on your severum personality. I got my male green severum when he was 2". Took him 2 months to get to 3.5". Half year later, he is 5" big. He was smaller than the female when I first got him. Now he is 1.5" bigger than the female. I also have 2 more Heros sp. 'Rotkeil'. Both of them were 1.5" when I got them. One of them grew 1" within a month. The other...only .25" in a month. Problem? Because the bigger one wasn't scared to eat with big guys. The smaller one was scared of his own shadow.

As for Green Terror...mine is 6" right now. I got him when he was 2.5", half year ago. He eats like a pig. When he got to 4", he grew an inch each month.