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Discussion Starter #1 (Edited)
Did I kill or can I kill my purple coralline algae?

As you may have read in other posts my tank was very neglected for a long time, water quality was never very bad, but I was running with old, half burnt out lights for probley 6 months, and water quality was not great. Did this kill my purple algae? I have good lights, good filtration, and good water quality now so will it come back, the rock used to be covered by purple carline. Or do I need to get some seed rock to re grow it?
 

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It'll likely come back on it's own, but slowly. Coralline algae is calcareous and needs calcium to grow properly, so you might need to add supplements to your tank. I use the B-Ionic series and it keeps the Ca level in my reef tank around 420ppm, which is good for coral and coralline algae growth. Maybe your levels are high enough already; there are plenty of test kits for Ca and they're pretty reliable
 
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