You don't need that tank size for a single Auranti.
You don't want tankmates with an auranti either.
My pair killed literally anything that hit the water.
Hell, I'm sure some of my frozen prawns died a second death to those beasts.
Even if you discard the fact channas shouldn't have tank mates, ever, no matter what people say or what people post on youtube, you still face the temperature issue. They need a swing in temperatures that very little fish can take, and those who can are ridiculously insignificant to a channa's killing instincts.