Lifereef works very well
 

Hi,

I have been using an external overflow box made by lifereef since December and it works perfectly. The siphon is a bit tricky to get going but after you do you will never have problems with it. The outside compartment has a section within it for the siphon tube to make sure that even if the power goes out the water level in the tank will simply lower until it is equal to the water level in the outside compartment and then it will stop siphoning while still keeping the water in the siphon tube so that when the power comes on again the siphon will continue siphoning as normal. I have been very happy with this box, so I thought I would let you know.