Hi,
please please do not follow the above given very BAD advive.
A bare bottomed tank with no hiding places is really not a good place for ANY fish !!!
Channa NEED hiding places to feel secure, the more the better. In a tank with lots of hiding places the fish knows that every time he wants he can hide, but normally ot only takes a few seconds in a secure place when it gets disturbed and swims out to check whats up outside the tank.
I have tanks were really more plants and wood is inside than water, and in these tanks I can the se channa CONSTANTLY !!
In tanks with only few hiding places, the fish stay more shy and tyke cover more often.
Here are a few examples for how a channa tank should look like.
home of Channa lucia:
Home of Channa stewartii (on the pic but now housed by C. sp. Assam)
Channa pulchra (have fry atm)
Another tank (C. sp. "glaser-harcourtbutleri")
and so on...
Cheers