Turn the pump down so you don't overflow the tank. In order to raise the level in the overflow box you will need to close the gate valve on the primary siphon. I didn't see it in the video but I thought on a bean style you want to have a gate valve on your secondary as well. The secondary will also need to be below the water level inside overflow box but at a higher than level than the primary. It doesn't matter where the gate valves are located. I hope this helps.
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