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You're better off maintaining Ca, Alk, Mg and testing for them.
I was mistaken - I was not using 'Purple up' - I was using 'Purple Helix' - which contains corralline algae spores, etc - it worked well (or seemed to) - so I apologize - I do not have an opinion on Purple up.FWIW - I had a major issue after a tank disaster - with nuisance algae (I used a product - which was supposed to be coral safe - but resulted in a wipe out) - I thought - what do I have to lose - I used Purple up - and Seriously - All of my rocks are now covered with coralline algae (after about 4 weeks) - I do no other supplementation. No more nuisance algae at all - and No other issues - It was the best investment I ever made - from a supplement perspective - Highly recommended - It certainly won't hurt (IMO)

