Thanks for the insight everyone.
I tried a repair using lexan and bolting to the available sides, but w/o success. Ended up going to LFS and getting replacement cover (<$30). Fix took less than 1 hour - here is the procedure for anyone looking to do this in the future:
1. Use a dremel to score the rim around the top perimeter and then at each corner to allow the top to be broke off into a total of eight pieces (four sides x inside and out)
2. Gently pry each piece off using a taping knife.
3. Use a razor blade to remove as much residual silicone as possible.
4. Clean with isopropyl alcohol.
5. Apply aquarium safe silicone to inside of rim (run a bead in the trough of the rim).
6. Put rim on tank pressing down firmly. Add books to rim for a few hours to keep it settled.
After silicone cures your ready to go. Good luck everyone that tries this in the future.
I tried a repair using lexan and bolting to the available sides, but w/o success. Ended up going to LFS and getting replacement cover (<$30). Fix took less than 1 hour - here is the procedure for anyone looking to do this in the future:
1. Use a dremel to score the rim around the top perimeter and then at each corner to allow the top to be broke off into a total of eight pieces (four sides x inside and out)
2. Gently pry each piece off using a taping knife.
3. Use a razor blade to remove as much residual silicone as possible.
4. Clean with isopropyl alcohol.
5. Apply aquarium safe silicone to inside of rim (run a bead in the trough of the rim).
6. Put rim on tank pressing down firmly. Add books to rim for a few hours to keep it settled.
After silicone cures your ready to go. Good luck everyone that tries this in the future.