OK. One more thing before I unsubscribe from this thread. I believe the reason gbr's are recommended for a minimum of 20 gallon tank size is due to their territorial behavior. Yes, you are right I forgot about the 20 long. I hate they way they look so stubby, but they are mostly better than a 20 high. However, even in a 20 long if the rams split up their territory they would have 180 square inches each. One ram in a 10 has the whole 200 square feet. By the responses I feel like I had recommended he put in a silver dollar or something.