ok.. it's been 4 days and nights since I added the CC and with a 100gal water change... I still have foam. No negative effects, but still got foam.
My sump has three zones..
the first is turbulent crashing in and has the skimmer inlet.
the second is the scrubbers with some wave action and has the skimmer and chiller outlet.
the third is the calm sensor zone with almost no surface motion before being returned to the tank.
This is the same water flowing through the sump - but look at the difference in water surface
CRASH
SCRUB
CALM
The last stage looks like it has an oily film almost.. I tried to show it better here
My new waterfall ATS has nice smooth flow on one side but splashes more on the other, look at the water surface on either side
Sure there are lights on the right, but you can tell the difference in water surface "gloss?"
I'll make a video of my surface agitation - that might explain a few more things about the use of CC.