ATB Nano collection cup has been emptied and cleaned twice already, every 5 days. Photos is 48 hours after the 2nd collection cup cleaning. You can see how much is starting to collect at the top part of the riser within the collection cup. We are experiencing microbubbles entering the sump, but then this skimmer is running at 650lph-700lph consistently. In my opinion, I would rather have the skimmer running at this rate, rather than 500lph.
