Posted: 18/10/2014 at 08:38
I have a similar size pond, constant gardener and this year, two years after making it I had frogs in the pond. I have a habitat area around the pond for shelter when they are not in the water and I made a 'wildlife walk' along one fence so creatures can transit through safely- my garden is small and suburban so I can't let it run wild.
I also have visiting hedgehogs, I leave the gate open, have a log pile and put out food.
I'd try and do something to your feeder to put off the magpies and pigeons and attract the smaller types. Maybe a ground feeder with a cage? I do the same as Hostafan and chuck suet sprinkles in the undergrowth. It has worked as I now find empty snail shells which I never did before, thanks to a visiting thrush.
Things do still get eaten, occasionally completely destroyed but I don't make any attempt to control the slugs/snails other than what I've said above.
Good luck with the pond- maybe share a photo when it's done?