CS 250 Euro reef over flowing

[Skimmerking]

Well you think you have every angle licked in ths hobby. And bam you get hit with another unknow mystery .
This is the problem I have a 170 gal with a 20 gal refugium grwoing 5 mangroves and 2 types of algae and its growing with the help of a 175 MH ushio powered by icecap.

In the main display tank its lighting is 2x 400 14 sunaquatics. the power house is the Euroreef CS250 with Dual sp3's. running ozone at about 70-80 Mg and orp reading is sitting at 360-70.

Now the problem is the skimmer started to over flow today I have the gate valve mod on the skimmer and it's wide open and still its overflowing. I noticed the the ozone is resticting the air flow from one of the pumps, but that is to be expected.

Why is my skimmer over flowing Have I taken all the nutrients out of the tank NO3 NO4 NO2 from the system. ??????????????

Can some one expalin this SO as of now I have take n the skimmer off line.