My stingray filter has just broken i have a spare one(Hydor IPF3)???? but looks very old (came in a box of spares that came with tank). What is the best way of changing the filters over with out killing off the bacteria??

Put the foam pad off your old filter and put into the filter you are gona use.

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Bearded Dragons 1.1, Leopard Geckos 2.6, Pictus Geckos 1.1, Gargoyle Geckos 1.1, Australian Occelated Velvet Geckos 1.1, African Fat Tail Geckos 1.1, Eastern Collard Lizard 1.0, Desert Kingsnake 1.0, Royal Pythons 2.1, Corn Snakes 1.1