Purple Up is a fantastic product! I used it on my nano and loved the results.
You do not need it however. Keep your Calcium and Kh in line and the coraline will grow.
Also I agree with a previous statement... get some rock or rubble with coraline and scrape some coraline off the rock, filters off, and let it settle.
Lose the urchin as he will do it again if he has once.
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