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  1. Why isn't my filter working? It ex working before and now it's not

    Beginner Freshwater Aquarium
    I tested in a bucket and it work, the brand of the filter is hopar canister external. I change one pipe since it was really nasty and I put the two tubes into my tank and it's not doing anything at all!!! It has in and out outlet and I tried sucking both of the tubes but it didn't start, it's...
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