Anyone ever use "Purple Up" ?

Yep it is, save your money!!!
 
Purple up is such a waste of money. Best bet if you want some coraline algae growth is to find Kent Marine Kalkwasser. Kalkwasser is the best thing for adding Calcium to the tank, Which is what Coraline algae, corals and Inverts need to grow healthy. Save your money DONT buy purple up.
 
I've used it and it works well. I'd never buy it again however as there are much better (and cheaper) alternatives.
 
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