I have 3 ngt, 8 it, 1 ntt. All different sizes.
The biggest ngt, 7.5 inch is starting to show more aggression than before, but nothing serious. Ngt have been in the tank for about 4 months now.
A second e.r tank is up and running incase I have to move one ofthe ngts.
all other members posts above, I totally agree with.