Overflowbox fluctuations.

[Notsolostfish]

The past few days i noticed when i put the gate valve to a specific adjustement. And i get a tiny trickle to the emergency. The next day it changes. Its messing with my ATO my and whole system. How do i adjust it so it wont fluctuate! I have waterbox infinia 190.5 200G. And my vectra m2 running at 65% which is not a lot considering head pressure loss.

i feel like if i put it higher than the emergency pipe where j let some water goes through the emergency, the next day its letting more water in, and if i set it to have a tiny trickle, the next i wake up, and its below where i set it. Any solutions?

I also have my UV on a closed loop, meaning i pull water from display, and put it back into the display, through a vectra m2 pump. I dont know if its pushing more water down the weir making it unstable, i dont know what to do here to keep it stable. Thanks

 

[MnFish1]

Is it possible something could be partially blocking the outflow to the sump?