are much more peaceful than other GTs and others are extremely aggressive, and why does some GTs have shorter rounded dorsal fins, anal fin, etc. and some green terrors have long dorsal fins, etc. and would the rule of 29/30 gallons minimum for a blue acara which reaches 8" would be the same as for a peaceful 8" green terror? because they are both nearly the same color/shape is just that the green terror has "some orange on its fins"