Posted: 21/02/2017 at 18:12
There are probably frogs in there already - I find they are very good at hiding in the folds of the liner. If you are that unsteady on your pins GD, I suggest you should install a banister all the way round, and lay off the G&T
By the way, it was only last year that I had to re do and plant up my pond from scratch as it needed a new liner. The creatures appear as if by magic - my pond is very busy, and the planting has grown like stink!! I bought a bunch of watercress from the farm shop, and it made superb cover for the fish and helped to keep the water clear. It floated around and rooted itself in the various pots.