Now that I see how much cheaper things can be purchased online, I feel like I should get a back-up filter. I have a feeling the pump in mine might give up the ghost soon and I'd hate to pay PetSmart prices because it's an emergency. I currently have an Aquaclear 300 HOB on my 29g tank. I've been happy with it but those Penguin wet/drys look cool, or the cheaper wet/dry filters. Is it worth it? Any advice at all? THANKS. 