I prefer to mix my own 2 part with soda ash, sodium sulphate, magnesium chloride and calcium chloride.
I not a big fan of adding things to my tank to get my corals to colour up. I prefer good water motion, adequate lighting, clean water and maintaining adequate levels of nitrates and phosphates. Also maintaining stable alkalinity and calcium.
I have not had too much success while adding things and often it has led to unwanted algae, bacteria or dinoflagellates. Maybe I am doing it wrong, that is just my experience.
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