thanks for advice.guppy said:This is glass right?
Measure the panel including thickness and buy a new one, then as hardboiled says just use a razor to cut out the old piece, scraped off the remaining silicone and wash the area with white vinegar then silicon the new panel into place. You can hold it in place while it cures with cloth tape or strap vises. Follow the instuctions on the tube as for how long to cure it before use, should be much cheaper than buying a new tank and you can reseal the other seams at the same time.
