i have them both i a 75 right now... there only 3 inches. the rd bullys the jag a little but he has plenty of hiding places.... im looking 4 another 75, to put the other in. i agree with u though,, comfort does play a huge role... i change the water in my tank every 3 days, and i have plenty of hiding places to reduce stress. they both have grown an inch in UNDER A MONTH!!! im pretty excited.