I found a beautiful crowntail betta. He is gray, burgundy and white. I thought that having a 55 gal would be large enough since the krib pair I have stay on the bottom all the time, and the betta stays at the top..WRONG!!!!!! I added the betta to the tank and all seemed well. After watching tv for a little while, I looked over at the tank and it looked like shark feeding frenzy. I got up and went to the tank and BOTH kribs were attacking the betta and had completely eaten all of his fins. I mean that his fins are shorter than the fins on a female....way shorter...... I grabbed one of my 1 gal bowls and moved some water from the 55 and put him in it. So far, he is alive, but I am afraid that he will not make it through the night..... I have never seen fish attack another one that fierce and fast. I will go to the store and see if I can find some meds for the betta tank and go from there.