Help with BeanAnimal Overflow

[imclownfish]

Hello, we set up a bean animal style overflow with a modular marine overflow box when we set up out 90G. It’s been running for about 9 months now, but for some reason over the last week or so it seems like the overflow can’t handle the flow anymore? The drain used to be silent, but now the siphon on the secondary drain keeps getting triggered.
We have cleaned the internal weir, tried resetting our vectra to see if it had randomly increased output, but nothing seems to help. Any ideas?
Thanks

 

[Jimbo7]

Could you describe or show your setup to help us troubleshoot? Have you added any other powerheads to the tank in that span of time?
Helpful info would be:

• Size of return pump / head height
• Size of drain lines
• If you have any ball valves installed on the lines