That is one smart cat!! Thankfully, my cats haven't figured out how to get into the tanks... although my fat cat does enjoy sitting on top of them sometimes
Which is why the ones he can get to have the really really strong wire lids on them... lol... Below is a pic of his one and only adventure into a tank -- which was unoccupied at the time, as I was just in the process of setting it up. For size reference, it was a 10 gallon
I love cats, but they certainly do have their moments!