I have a pond in my back garden (although my goldfish may call it a ghetto)... Anyways, recently had to get some stuff and in a hurry. Came across this site www.thebigbigpetshop.ie
I am posting about them because the service and the cost were both excellent and I think it's important to promote Irish businesses in the current climate in particular. I don't know how often I have seen Irish media (newspapers or mags) promoting products or services and then showing a UK address or company. It drives me mad! Anyways, try these guys - they've a very large range and very obliging!