I'm about to admit defeat with a small pond in the garden. It's in a shady spot but I think probably too shady. The first couple of years we got tadpoles and it seemed fine but it's gradually turned into just stagnant water. Doesn't matter how many oxygenators I throw in, everything just seems to die - even the duck weed has gone (and i throw in a lot as we have another pond elsewhere in the garden where they thrive). It's next to a hedge and it also gets clogged with leaves and apples in the autumn. I try to cover/scoop out but it doesn't seem to make much difference and if I'm honest I don't really have time to be going out daily to keep it clear in the autumn which it probably needs.
So my question is: does anyone have any great advice about what might help it back to health? Any shady pond plants? Or if not, what other good wildlife habitat might be worth putting in? It's part of the larger 'wild' garden which has the hedgerow, a trench, mounds and logpile etc already.
Thank you!