fyi. the guys at my lfs were bummed that petco switched to Tetra tanks because they thought the Aqueon versa tops wouldn't fit. i had already put a marine land glass top on and it fit fine but i wanted to test the aqueons as well, so i stole the aqueon top off of my 29 and tried it. fits fine on the my 20L so i would imagine the will work on the tetra 29s too. just thought i would let everyone know. not sure about the other sizes though.