Bubble Magus 180cs cone skim problem

[born]

So my skimmers been going crazy for the past couple days.
Ive been dosing medication for ich, and one of the things was to shut the skimmer off. So I did, but after trying to turn it back on, it has been bubbling over and going crazy with foam.
Its sitting in just over 8inches of water, and I had it at the "3" setting always. And no matter what setting it overflows/foams outta control.
Ive tried cleaning every little part of it but its still goin nuts, any ideas??

Im goin on vacation tomorrow night for a week, so i kinda need to get this solved asap.