Aquaclear aquarium filter refillable carbon box
thingiverse
This is a refillable carbon box for aquaclear/topfin 20 filters, although it can be resized to fit all sizes. Simple add activated carbon to the box, rinse the box under cold water (to wash away dust) and place in aquarium filter between the sponge and biobag. Depending on your printer, you may need to add a light line of hot glue to the lid lip to ensure a tight fit I've been using this for roughly 8 months, and the PLA has had no effect oh my corydoras, goldfish or betta, all of which are in tanks with this box.
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