Asians can be nasty! I guarantee my RTG would put most jardini to shame when it comes to aggression . "He" was fine until roughly 16" mark then turned mean , he's killed every tank mate raised with him and every fish I've tried to introduce since has been slaughtered , tried every trick in the book , bigger fish (some twice his size) , tiny 1" dithers , new tanks , different setups , different conditions , you name it and he kills everything! Even my Fly River turtle (10-12"ish) had to be removed because the RTG would grab her and thrash her around when she went up for air , he's even bitten me many times .
I'm sure he's on the more extreme side of agresive behaviour but I think most of the more docile aros are either young , stressed or obese and over fed to the point of being to lazy to act natural .
The only tank mates who did "alright" was a dat who had been raised with him and it lasted years , he was too quick, willinh to fight back and when in a fight with the Aro he frequently went "unstable" coloured (all black) and In the big , dimly lit, liquid rubber costed tank he was invisible when showing those colours . That combo kept him alive for a good 5+ years but one day during a water change the RTG found and cornered him while water levels were low and took him out
![Frown :( :(](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f641.png)
. I also had a big pair if 22* endlies who did very well with him , the Aro took out any bichir smaller then them when breaching for air but those big brutes were fine .
I personally would not dare mixing aros without a pond or pond size tank!