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pool filter sand

  1. Beginner Freshwater Aquarium
    I have a coloured gravel substrate in both of my tanks. Three main reasons I am switching to a sand substrate: 1. I have Schwartzs cory (Corydoras schwartzi). Sand will make them more comfortable. 2. I have 2 amazon swords, a wide leaf sag (Chilensis), and two something that look like ludwigia...