I have since added a 29g sump with ATS, and took my RO HOB skimmer from the DT to the sump. I took off the 90 degree elbow that sucked in the water so it would be under the water level in the sump. It appeared to be running ok for a week, then now its barely producing bubbles? I plugged the air tube and it produced a ton of bubbles. What do you think can be wrong? I took it all apart, cleaned it and still the same thing. I tried turning off the return pump to raise the water level and it still didn't do anything.
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