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filter questions

  1. filter rod is harmful to fish?

    Freshwater Aquarium Equipment
    Hi.. I have 10 gallon tank with 4 fishes in it. 2 panda platy and 2 zebra danios. I bought it 3 days back. While buying fishes i had asked PETCO to check the water and everything was fine so I bought 4 fishes. Till today morning everything was fine, suddenly in the afternoon I noticed my one...