Yes ive kept a fair few, been out the game a while, but got a new 5/2/2 coming, so watch this space, going for something a little different this time, however, got more tanks in reserve, im going to look again for parachanna obscura and channa pleurophthalma,my favourite of the bigger species ive kept, No not all Channa are Sub tropical, but most of the "Dwarf channa" are Sub tropical, with a few exceptions,,
People mis understand channa, as most like to be kept in well planted tanks, best kept in Species only, not because there so aggressive, actually the other way around,,
One thing you will NEED to know, Channa are Escape Artists, ensure any small gap is well covered, seriously, even if you think nothings getting out that hole, because they will..lol