What hybrid type?
Either way all avaliable croc species will exceed 4ft+ and will become aggresive,especially when they get older.yes,if handeled as baby's they can somewhat become "socialized" if handeled when young,but adults will only bear a slight tameness.Dwarf caimans can be housed in most standard LARGE aquariums.And don't get spectacled caimans.Most are somewhat expensive,but they are shy,especially when babies,which causes them to get nippy.Then,as adults,they retain this and will be very aggresive,and lose most of their shyness too.American alligators are hardy,but large.Not way too aggresive,though when they are,they are EXTREMELY dangerous.Handling them as young will help alot too.Females don't get as large,and though I wouldn't reccomend any of the two genders,or croc species for that matter,if your depserate on getting an ali,go with a female.Most get 6-8ft long,which is still large,and can be more or less docile than males,though I still wouldn't count on it.Finally I'm going to address nile crocs.Not extremely common,however,a few quick searches will help you find a couple.Not very expensive becuase most owners want to rid of theirs.They get 11-16 ft mostly,and are,very aggresive,I repeat,keyword AGGRESIVE!