You all know what they say about opinions..... haha... I personally used purple up and liked the advantage of it, HOWEVER it started to overgrow the other coraline I had in my tank. I have beautiful burgundy colorations and I honestly would prefer to have that over the purple/pink. I stopped using purple up, but for the begginner who is wanting quick and simple way to boost your coraline growth, purple up is the way to. I went back to using Kents Liquid Calcium, That stuff promotes the growth of the coraline you already have.