Skimmer Overflow - can it be plugged?

[Coralgurl]

Great responses, thanks. I have the intake fairly close to a powerhead, I can relocate the skimmer. Its a used skimmer so no break in period needed. It was skimming great and could go a couple of days, dark skimmate. Now its clearer and filling fast. Nothing dosed in the tank, water change done last week. I will pick up longer tubing and run to a bucket. No hob filter on the tank, bucket is a good cheap solution!