And Nitrogen and Phosphate. It's one of the major reasons mature, properly filtered tanks stop having green/etc algae problems.Not only does it grow like a weed but it sucks up alk and calcium
Don’t waste your money. Frags and snails will bring it along. I’m at the 6 month mark with my tank and it’s exploding. Starting to show around 4 months.
I added a bottle of ARC corraline spores to my latest tank at 3 weeks (all dry rock) and at about 6 weeks I've got significant spotting on the back panel (hundreds of spots, probably 40% total coverage). Jumping 10 weeks ahead for $22 is a pretty good value in reefing.