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corydoras keep dieing

  1. Beginner Freshwater Aquarium
    ive had my 55 setup for several months and is passed the cycle. i went through about 12 cories already. everyday i come home to another dead. i have about 4 kings of plants. i originally bought 6 emerald cory and all but 2 died the i got 6 panda cory and they all died. a week ago i just bought 4...