The coral on the right is a Galaxia and the coral on the left is an Acropora. This used to be a beautiful Acro which I had grown for about a year from a small two inch single branch frag. Then, one morning , I noticed a small part of the Acro was white. I resolved myself to keep an eye on it when I got back home from work. After I came home at night, the white area had grown. I did the usual water test and everything was in the normal range. All the other corals looked healthy and the fish were as strong as ever. I called Bob, our expert from The Reef Aquarium DVD, A Set Up & Maintenance Guide.
“Are there other corals near it?” Bob asked
“Yes, there is a large Colt Coral on one side” I replied.
“That wouldn’t do anything, Colt Corals are not aggressive” said Bob. “Anything else”
“Yes, on the other side is a Galaxia”.
Bingo! That was it, Bob told me. “Galaxia’s are one of the most aggressive corals. They have long stinger tenticles and do most of their damage at night to other corals. ” It happened that it turned white first at the part closest to the Galaxia.
Since it was mostly white by now Bob told me to pull it out as a dead coral is a green algea magnet.
I was really quite amazed that after a year of living next to each other that the Galaxia decided to kill the Acropora. There was plenty of food and light for both, and both had grown over the year. It must have been both were getting too big for the space and the more aggressive coral decided to show who was king of the hill.
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Posted by Reef Man
the review from the April issue of Tropical Fish Hobbyist:
Posted by Reef Man 