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  1. Upgrading from 20 gallon to 75 gallon

    Beginner Planted Aquarium
    Hi everybody! I've had a 20 gallon high tank for several years with a Fluval/Aquaclear 20 gallon HOB filter and a Fluval/Aquaclear 30 gallon HOB filter. There's CaribSea sand substrate, fake plants and fake logs and caves. For fish I have 4 harlequin rasboras, 3 spotted cory's (Corydoras...
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