Yep..
I have a c. argus, right now.
It is an easy fish to take care of IF you have a big enough tank..they grow to around 1m in length!
I can't speak for the spices in general, but mine is quite shy and not at all aggressive, it is very greedy though and will happily eat a feeder 1/3 of it's own size..
I am trying to get it to get used to pellets and such, but without any luck so far, so for the moment it is all live food.
Water parameters are not critical and the same goes for the temp.
My parameters are ph7 and a hardness of around 12-13gh, temp is 22-24 degrees.
They do produce a large amount of waste, so filter and change water accordingly.
I change 25% water everyday.