Brand new pond with fish. Pond is in a wall, so it’s long and thin and just under a metre deep. DH made a few random purchases so there is a waterlilly in there - but it’s very fragile- lost 4 big leaves in transport - it being left along now but I don’t know if it will survive. He also bought some floating individual plants , but two days later nearly all are gone- not sure what’s had them! I’d like a variety of different plants - above and beneath the water- any advice welcome