im looking to get more snakes and was wondering does anybody keep these guys

hgow big do they get
and they agressive
do they stand up like real cobras

and any more info would be great thanks
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Zero to 4 legs
1.0 Black rough neck monitor
0.1 bearded dargon
1.0 ball python

soon to be getting
1.0 red tegu
or
1.0 b/w tegu