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DIY (Aquarium) Gravel Cleaner
Ok, but why not just put some holes all around your "square container" so that the gravel will not be able to rise all of the way into your tube? Fish poop and what not ain't that heavy you know.
The link for calculations are not working. Can you provide calculation or link again? Thank you.
Building a Hamburger Matten Filter (HMF) for an aquarium
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