Berlin Red Sea skimmer,help,,

[conchead]

I have a 120 mixed tank, has been up for about 6 months, all params are good. Skimmer has been working like a champ all these months, I'm amazed at what it pulls out.I took out my, in sump, skimmer and cleaned it, also clean the pump and impeller,now it doesn't seem to produce nearly the amount of bubbles and is not skimming out what it used to. Have tried the air tube adjustment way open and almost closed, doesen't seem to make a difference,it is not clogged, just doesn't produce the bubbles it used to. Only thing I did different was a 20% water change with reef crystals instead of instant ocean. Any ideas what could be the problem?

[RyanM]

Give it a few days, new/clean skimmers take a few days to slime up

[synthesis]

What RyanM said. Skimmers need the slime to skim properly. This is why new skimmers are tough to adjust at first. Your 20% water change may also have an effect on it. Give it another 3-4days and it will be back to normal.