
What natural suction is occuring with an internal overflow box?![]()
12 gallon jbj nano has a overflow option that is sucked to the hole that is drilled in the back of the tank through water flow..with out the flow it will not stick to hole that the water is flowing out of the display part of the tank through...
Ray:
You would use one like one pictured below (shorter of course) to cover the strainer.
It has no back.
I would not rely on "natural suction" (whatever that is).
All it takes is a little silicone to keep it in place.
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Request a shorter one, just enough to cover the bulkhead.
Those pictured, are used more for tanks that are drilled on the bottom (but you probably know that already).
"Calfo" internal overflow box
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