Sorry there Marco i just clicked in to the question, You have a oerflow boz on your tank andyou wish to to stop breaking a flow when the water is off.
ok do you have a air line attached to the overflow box that has a pre set on it to start up the water flow again.....
I hope this makes sense.
mike
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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