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Saltwater Aquarium/Button coral and Lobophyllia retracted

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Lobophyllia
Lobophyllia  

Button coral
Button coral  
Hi

I have button coral and Lobophyllia that have retracted.
They use to be open but suddenly they retracted.
I have no clue why.

I check the levels of MG, KH, CA, Nitrite and Phosphate every week and I am using dosing pump for KH and Mg.
I do water change monthly almost.

Here is the levels in my aquarium

Phosphate 0,25mg/L
Nitrite: 0,5mg/L
KH 7,7 dKH
Mg 1410 ppm
Ca 500 ppm
Salinity 1,025
Temperature 25c
Good water circulation
I use active carbon + de*nitrate in the external filter (have no sump)

I am using LED light (http://www.aliexpress.com/item/120cm-48inch-4ft-programmable-controlled-led-reef)

My Aquarium is 350L = 92 US gal
2 years old.

I send some pictures of the aquarium.
I can only send 2 pictures.
Tell me if you want more pictures that show the placement of the corals in the aquarium.

Any idea?

Regards.

/Oualid

Answer
Hi Oualid:

From your description and images, it would be hard to form an exact cause as to what's happening in your aquarium. It seems that you're doing everything right in regard to maintaining a healthy aquarium.

My best guess is the Green Frogspawn Coral (Euphyllia paradivisa) that I noticed in the image with your button coral is to close in proximity to these corals, causing them stress. Frogspawn coral need plenty of room, and should be placed far away from other corals.

I wish you luck with all of your future saltwater aquarium endeavors.

Regards,
David  

Saltwater Aquarium

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David Ocreef

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Technical saltwater coral reef related aquarium questions are welcome. Coral, invertebrate, and peaceful species of saltwater fish questions are welcome. Questions asked on Saturday and Sunday will be answered the following Monday. REMINDER: Please check the answers pool to see if your question has already been asked and answered. Questions typically are answered within a 48 hour period, however sometimes it may take longer.

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I possess over twenty-five years of hands-on experience and knowledge in the ecology of aquariums. Beyond the traditional, I have successfully tested and sustained environments that have been uncharted territories for hobbyists, for decades. I am the first to admit I don't know it all because there will always be something new, amazing, and exciting to learn about, as discoveries are made. It's a hobby one can never outgrow, or grow tired of.

Organizations
MASNA - Marine Aquarium Society of North America. Director of Orange County Reef Aquatics - OCReef.com

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Articlebase.com, Ezinearticles.com, Ehow.com and many others.

Education/Credentials
After High School, my experience and love of marine animals influenced me to take up studies in Marine Biology. Throughout college, I studied Microbiology with an emphasis on Marine Life, as well as numerous other sciences. I continued to advance in this hobby, by building a dozen or more saltwater ecosystems all utilizing Microbes as the major source of my filtration method.

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