The 4' 120 offers more square inches of floorspace...
I have a 4x2x2 120 gal currently housing a Trimac Pair (M-10"/F-7"). I hope the tank can house them for life without a divider but only time will tell...
I've had this tank for a while and have thoroughly enjoyed it (except on moving day). The extra 6" front to back makes a HUGE difference...
I also have a 6'x18" 125 but not a 5' 120.
Based on my experience with these tanks I feel the 4' version is better for one or two large (12"+) fish... but the 5' version would be better for a small community of medium (9"-) fish...
I have a 4x2x2 120 gal currently housing a Trimac Pair (M-10"/F-7"). I hope the tank can house them for life without a divider but only time will tell...
I've had this tank for a while and have thoroughly enjoyed it (except on moving day). The extra 6" front to back makes a HUGE difference...
I also have a 6'x18" 125 but not a 5' 120.
Based on my experience with these tanks I feel the 4' version is better for one or two large (12"+) fish... but the 5' version would be better for a small community of medium (9"-) fish...