We have just restored an old pond in our garden, it is about 2m by 1 m in a sort of kidney shape, about 2 ft deep in the middle. Have seen a few newts and frogs and want to encourage them. Would like a few fish possibly. Don't want to spend too much money and have no knowledge of water gardening, where do I start. It has a plastic liner and has had water in for about 4 days. Help!