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  1. Need Help... My fishes are dying.

    Cyprinids and Atherinids
    I am new to fish keeping and had the tank for only two months. My Tank size is 55 gallon and When i bought the tank i bough 10 gold fish and 2 placos with it. I do around 25% water change every week and gravel cleaning every 15 days. It was all fine until last Saturday when i did my gravel...