Temperature 18-22 c, although does get exposed to higher temps during the summer. another sub-tropical species ,do not keep them too warm year round ,they will die of infection please bare this in mind...
I would imagine you temp will be higher than this?
It is new so hiding is normal, however i feel the tank mates are not the best for him, jack probally is intimadating him, frogmouths? as in Chaca bankanensis ? if so there ambush predators, might well make a meal of the channa