well i made a lid for her 5 gallon tank (until i get a 20-30 gal one) out of an old cable box case and it sits down in the groove of the tank and i have a piece of twist tie so i can open it so the cat can not open it but she watches her a lot in her tank

7E5B0826-orig_zpsb4e3588c.jpg Photo by jwolfe152 | Photobucket