Has anyone tried cutting off a piece of the All-Glass Versa Top http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=3790&Nty=1&Ntx=mode+matchallpartial&Ntk=All&N=2004&Ntt=glass%20top&Np=1 . I need to cut off a small piece to fit in my filters.