building permanent rock perimeter to pond

Question
Hi, Leigh, and thanks for your time. You've helped me in the past - so here's another "challenge". We have a more than 100 square foot native plant/butterfly garden adjacent to our chruch property (no security) and we put in a 600 gal pond with native rock accents 18 months ago. We had vandalism - rocks were thrown in to the pond - and that has been recurring. I wanted to wait till I had gone through the learning curve before I decided how to rebuild the scape and scope of the pond. I've now  decided to remove most of the lower shelves, all of the gravel and build a permanent, natural-looking border of rock. I need to know what to use to bind those border/accent rocks together so that they can't be thrown in the pond. The look of cement is not what I want, even though much will be hidden by vegetation. And I was hoping I didn't have to build any kind of "footer" for the border. Is there an epoxy or some such that would be fish safe? We are in SW Florida so frost-heaving is not an issue. I would really appreciate all your suggestions on this issue.
Wishing God's blessings on you and all of us, who care for His wonderful creation!

Answer
There is a type of epoxy they use to patch holes in concrete floors it does however have a grey color to it. If you were to use it sparingly where the rocks touch each other this would bind one rock to another and discourage vandalism as the whole border would become one large rock. The only other thing is to sink the rocks into a bed of concrete which you do not want. It is a shame that you can not leave the rocks unaccosted. The epoxy should be available from a building supply store.

                     Hope This Helps
                        Leigh