Just got a nice new 120 g. tank, don't have a stand yet. Currently have a lone 9" male Dovii in a 90 g., and a 4-5" Green terror with a few others in a 40 g. I'm really liking the Dovii in the 90.......He seems very chill and comfortable in there. I'd like to eventually move him to the 120, but I'm not sure I'm ready yet at his size. When should I move him for sure?? I know most of you would say get him a 300 Gallon now!!! Hahahaha...... In all seriousness though, he's only hovering near the 10" mark!? Is the 120 really necessary? At his size now?