That is eesentially where the majority of the top of my bubble colum is set to, so the bobbles are very dense at the collar and start to break down from there, I find with this I empty the cup every 2-3 days and it is really gross, dark, dark skimate.
And yes welcome to the club spiny, you will be happy.. 
__________________
75G, 100 lbs LR, Inwatter Stingray LED's, 25 Gallon Sump, 24wt UV, hermits, Snails, pep, fire & cleaner shrimps, Blue Throat Trigger, Perc Clowns , Yellow Tang, Coral Beauty, Blue Regal tang, RBTA, Coral Banded Shrimp, Checkerboard Wrasse, Many Corals, Royal Tux Urchin
|