Hi there, I thought for my summer project this year I'd build a wildlife pond. The hope is dug, shingle is at the bottom, just about to put sharp sand in and the rains came. I keep it covered up with some old bunk bed to stop hedgehogs, cats, foxes etc from drowning, but it has a few holes drilled for screws. there is a lot of clay and the hole is filling up nicely, lol. Can I just go ahead and put in the sharp sand in and the bath??? On the plus side it's catching the slugs nicely. Any advice very welcome. Picture attached