I am presently running a Seaclone 150 and it took a few days to "break in". It was quite finicky to adjust at first. Now, it's producing scum at a steady volume and I empty the cup every second day (about 1/2 full). Mind you, there is only the LR
in there at the moment. I think the curing period is over because the volume of scum is way down from the beginning where I was collecting 1/2 cup every day. The water is crystal clear at the moment and the foul smell is gone too, much to my wife's satisfaction.
That being said, I'm not sure if it will still be doing a proper job when I introduce the fishes in about a month from now. Will have to wait and see. HTH