DIY Fish Bowl Gravel Vacuum

At the pet store every now and then, I see a staff person vacuuming out the gravel in the display tanks.  It' s so efficient to just get under the rocks and siphon out all of the gunk that settles in there.  But I've got a little fish bowl, well, really and indoor pond since…

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LL Products Gravel Vacuum for Aquarium - Fish Tank Gravel Cleaner- Aquarium Vacuum Cleaner -Aquarium Siphon - 8 FT Long Aquarium Gravel Cleaner with Minnow Net

DIY aquarium gravel cleaner / air powered/ easy and cheap

GADFISH Gravel Vacuum for Aquarium Water Changer Fish Tank Cleaning Tools, Siphon Universal Quick Pump Aquarium Water Changing (30ft) : Pet Supplies

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Safe to make my own gravel cleaner?

XEOGUIYA Aquarium Gravel Cleaner, Gravel Vacuum for Aquarium Fish Tank – KOL PET

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How To Make DIY Fish Tank Gravel Cleaner