yeah they are getting big, the jur is now 12" while the tig is around 10-11"; the tank is a 4' x 2' one... I will probably give the tig to my brother later, as he has a bigger tank...It is rather well known that brachies past certain size/age, especially tigs and jurs in any combo, are territorial and do not tolerate intruders, often even other similar-looking cats, like TSNs.
What happened is logical and is to be expected, IME, that of others, and based on their profiles. The opposite would be unnatural and strange. It was only a matter of time in a small enough tank. In a several 1000 gal, they may be ok.