[chris1121]

I was wondering what would cause my coralline algae to die off suddenly. It was growing nicely on the glass in circles the size of quarters, in the last week the centers of each circle is disappearing. My chem seems ok:

45 gal
10 gal sump
remora c skimmer
nitrates 0
nitrites 0
phos 0
ph 8.3
cal 420
mag 1200
hardness 8
temp 78
2 clowns
1 green chromis

Thanks.......................