For 5 years, I had a yellow SPS in my small tank. I thought it was very nice and was always healthy.
I took some frags into my new tank and my yellow SPS turned bright green.
My point is, it might have been yellow in someone else's setup and it might be something different in another.
In my particular case, the differences were: Different salt brand, 175MH vs. 250MH, and Kalk vs. Ca reactor.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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