The fix will work, however, you would have to cut away the old silicon on the inside around the bottom. Don't cut between the panes. Then you would have to have the plate cut to fit exactly and lay in the bottom of the tank. Once you have it prepend and ready you would lay a bead of Silicon around the parimiter . Carefully place the new sheet in a press evenly into place. At this point I would usually run my finger around the edges to remove the excess silicon and make sure it is secured. Let this dry for at least four hours. Then I would razor away the edges I then run blue tape about 1/4 inches away from the seam for a nice edge. Run another bead of Silicon,run ,your finger around to press It in and remove the excess, pull the tape off and then I would let it sit for 24 hrs. Test fill it some place safe. Sometimes easier to buy another.