Hi,
what do you mean with mix ? crossbreed ? or stay together peacfully ?
Sp. Assam and bleheri seem to me the most peacful channa I have ever kept.
My first two male sp. Assam lived together with three bleheri in the same tank.
There were no aggression between Assam and Assam , bleheri and bleheri , bleheri and Assam.
But it depends on the moods and charackters of the fish, It can work but it can also fail.
I would not recommend to do it. Even if both species are subtropicals. And its also not sure that they cant crossbreed, whichwe all should prevent.
Cheers