First of all, nothing wrong with newbies giving advice - as long as it is not incorrect or bad advice.
Secondly look at how the question was asked. The thread title is misleading. How to expect people to reply?
I believe a good response comes from how clear and specific the question was asked.
To answer the question, remove as much xenia as you can and cover the remaining base with epoxy or super glue gel. For epoxy, be warned that it is toxic if used in large amounts, especially if your tank is small.