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I have had if for a little over a year no tissue recession nor any bleaching alkalinity is steady at 8 and my calcium sits right around 420 I will try sucking the bubbles of today here's a little better pic last month with no bubble looking things
Have there been any recent changes? Anything else showing such in the tank? It does look like some bleaching to me...might not have to cut it off yet but I'd keep it in the cards if it spreads.