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- Jan 15, 2019
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A few weeks ago I ordered this rainbow hammer coral online. The hammer coral ended up getting stuck in a warehouse overnight and the water was probably about 50 degrees when it finally arrived. Now to this day the coral is healthy and open, but it looks bleached from the original pictures. I've heard how when coral is found in cold water it can kill off zooxanthellae algae thus causing this bleaching. I was seeing if anyone else had this happen to them and what the long term effects where. I'm assuming the color will come back, but how long does that usually take?