I have read some of the other post, but I have some specific questions. Can any or all three of these fish live together if started as fry or juveniles? How long will they live happy in a 75 or 125 gallon? Will it be best if I had maybe one of each, or is it better to get one pair per tank? I have plans on getting a 240 gallon, but can only find 210-215 gallon in Eastern NC.