Grr!!! I am so mad at my cat right now! I came down to my room this afternoon after being gone for a few hours and I find Koi missing! He didn't jump he has a lid. Its a rectangular tank. She must have stuck her foot in the filter hole and got him. I am so sad and mad! Koi was my favorite. Now I want to move another guy into his tank but am scared my girl will get him to! Any suggestions?