thebiggerthebetter
In my experience, goonch that is 12" or bigger is hardier than small one, or perhaps, I'm just suck with grow out. They tolerate a wide range of temperature, need more oxygen when water temp is higher than 75. As for transport, it's not hard, since they're not fast, constantly moving like lince. You just need a container just slightly longer than the fish length, even if it's the diagonal and not the long side of the container, a good air pump, and some Prime to add into the water just before you leave the seller place. Just put water barely cover the top fin.
If I was you, I would go for it Viktor. I've killed 2 goonch due to filthy water, plus 1 goonch because it ate a datnoid, which it regurged a few days later, and died 2 days after it regurged the fish. Those are large ones. I also killed 3 small ones, grow out at 5-6" when we had a heat wave. None died mysteriously.