I had never even herd of a ram until I started reading posts on here about them and so I'm still doing research on them and so far I like the Bolivian Ram and the German blue ram. What's the big differences in them other than color? Is one more aggressive than others? Does one require anything special than the other? If you have them in your tanks at home what do you have them with, have you noticed they do better with some types of fish compared to others? Also if you can remember about how much you paid for them.