Depends on how you mount this over the tank. If you use the RMS arms, don't think it will. Just measured the mounts and although they are 6 " wide (giving you 72") you'll need at least an inch or more on both sides to provide a solid connection for each of the arms attachment screws. I have a 72" tank now, and bought the 70.5" rail. Thinking the 60.5" rail is best suited for a tank less than 65" (if you use the RMS arms). But if you want to hang it from a ceiling mount - should work fine.