Not too extreme, I usually get 2-3 days out of mine but its much darker than your picture. If the skimmer is broken in, it should have gotten something. Is there any foam at all in it? The 115 skimmer seems pretty finicky, I finally got mine set to where it will produce and I haven't touched it yet.Been replacing filter floss every 24 hours, normal? Also my skimmer hasn't pulled anything in a week.
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On my nano I change the floss about every 3rd day, but when I do it is much darker than your picture. I also run the 115 skimmer. It can be very finicky at times, sometimes for no reason. When it does work it pulls good skimmate although it is always wet. Try tweaking the skimmer height and knob a bit. I can leave the settings exactly as they were, but do a water change and sometimes that will throw it off, and needs adjusting againBeen replacing filter floss every 24 hours, normal? Also my skimmer hasn't pulled anything in a week.
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Honestly, that's probably better skimmate than I get. Good job. I think when my tank was starting out I may have gotten it that thick, but I haven't seen neck build-up like that in a long time. I do still get liquid almost like yours though.
2/3 of the equation is the skimmer and how it is dialed in, the other 1/3 is the rest of the tank (bioload, filtration, etc.).