Well reading the bottles they all say the bottle itself doesn’t contain coralline. It’s just the spores that help promote the growth of coralline. I used ARC once and didn’t see any change after two months. Eventually found an outdated “Purple Up” bottle did a little of that. I now have coralline growing on everything. BUT I don’t think it was because the bottles. I stabilized my tank got rid of Dinos and now it’s back on the rise. My tank has been established for a few years, I had a coralline die off from moving is why I did all this.
Just a little help here. ARC contains corraline spores. Purple up is aragonite, aka expensive powdered sand. So you're purple up helped your ARC spores. Please read the ingredients