LOL, I got to disagree though, there are lots of "agressive" fish that fit in a 20g. It just depends on what you mean by aggresive. Sticklebacks are very aggresive towards each other and fun to watch. Somehow I don't think this is what he means though. He could also stick in a large arowana if he folds it right.Vitaliy said:Look man, I did not feel like saying this in any of your first 10,000 posts but you need to shut the hell up about your damn 12/20 gallon tank. People give you tons of suggestions and all of them go ignored, there is nothing "aggressive" you can stick in a damn 20 gallon tank. Relax and shut the **** up, will ya?