Vertex skimmer overflowing?

[fkshiu]

It's most likely oils in the tank such as when you feed mysis or have your hand in there. Are you adding garlic to the food?

I found that this problem can somewhat be alleviated with a gate valve mod.

[atc]

nope, usually happens overnight

[fiorano]

my euro reef always did this until i installed a baffle after it in my sump to keep the water level consistent.