Skimmer going to find the garbage soon

Question. I have a 20 gallon nano reef. Had it up and running for about 4-5 months now. I have been running a reef octupus skimmer hang on the back, says it"s good for up to 90 gallons. Great skimmer. At least it used to be. ANyway it took me awhile to get it dialed in. Meaning by raising and lowering the colection cup till I found a good setting with the water level to where I needed to empty pretty dark liquid every 3 days or so. And then that would only be like a halfway filled. But all of a sudden like overnight that level where the collection cup was it now gets filled with clear bubbles and water in 12 hours. So I dumped that out and raised the collection cup up. Again filled with clear bubbles and water. Raised it up again. Same thing again. My collectin cup will soon be off of the skimmer. I cant raise it anymore. What went wrong all of a sudden. I didnt do anything different. What would make this skimmer make bubbles so high up on the skimmer. It worked great before. Thanks

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Skimmer going to find the garbage soon

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