I have it all over the rocks in my tank that have been in the system the longest. You usually see this in well established tanks. I've had some other colors pop up from time to time like orange and yellow as well but they usually disappear after a couple of days....
I hope mine isnt bleaching, havent had any problems with air bubbles or temp. I notice new deep purple coralline growth every week but the 3 spots of hot pink are about 1 inch spots and they are in different areas of the tank and haven't changed in about 2 months? they are definitely not just ordinary pink they are fairly bright pink.
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