We had an ornamental pond, which after the fish got eaten by something I just let it go. There is a pump and waterfall feature, so the water was not stagnant. Now, after 2 years, I have various self-sown marginal plants, the water is teaming with bugs and larvae, and we have a family of toads who feast on the slugs in the garden. I planted borage and buddleia, along with other bee friendly flowering shrubs, and the raised veggie beds are organic. I love my garden, it was life saving, mentally, during lockdown.