why did my skimmer overflow?
 

Last night the level in my collection CIO was about an inch. This morning it'a full and overflowing. I adjust the valves and I can't get the level to go down. I don't see any issues , any ideas?

Could it have been due to a water level increase or decrease in the sump? Did you dose or add anything to the system? Feed something different?

I find when my water level lowers or raises if my ATO resevoir is low, or my herbie is being problematic, thats when I get overflows from my skimmer.

Did you use any reef epoxy? Makes my skimmer go nuts every time.

^ +1

This happened to me last night!

Mine overflows if I don't change my filter sock before it overflows.

No changes in level, dosing, food or epoxy. Like I said though, when I turned the level adjust valve to lower the level in the Skimmer it did nothing. I can't get it to come down at all. I removed the collection cup and am just letting it overflow into the sump.

something shedding gametes could do it?
maybe
:angel:

Do you have anything that could spawn, or spew their special goo? That could cause it.

Air intake for the skimmer plugged or restricted?

If you're having problems even when adjusting it then you might have a clog somewhere.