I have upwards of 25 different colonies of zoas and every once in awhile a colony just closes up for weeks when all the others are fine. Sometimes they magically open back up and return to normal and other times they just melt away. Its a zoa thing. Been trying to figure that one out for years.
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Red Sea Reefer 525 XL, Vortec M1, Reef Octopus 150 SSS Elite, Apex, WAV power heads, 3 X Aqua Illumination 26 HD. 
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