I have a couple of 5" Oscars, and quite often I hear the glass lid open and close. I realize this is due to the fish hitting it, and I know it is only a matter of time that one of them ends up on the floor. I have a 125 gallon tank with the standard hinged glass cover. How do you all secure your lid? I am thinking about painting a 2 x 4 and putting it on the top. Have any of you done something different? Any one use velcro? Please let me know.