my friend got snake head with rtc, both same size abt 50cm length ....... it snapped the rtc into half
so it could work out but also could end up bad too ...
I would advise against keeping those two together. Nothing good will come from that set up. Eventually one will kill the other ...most likely the snakehead will get to the Aro. Also just the stress of sharing a tank with a snakehead could cause the Aro to develop problems.