Unfortunately, that is a common appearance associated with stony corals in particular. That is the classic example of bleaching which unless the problem is addressed and corrected quickly, the coral will die. My guess is that it is a direct result of the placement of your coral and the lighting scheme as well. If your Seriatopora is receiving too much or too little light, this will be the most common result as your corals zooxanthellae is being expelled(brownish yellow/green color) thus showing its calcareous skeleton underneath.
It could be similar to montipora and Acropora, and could be possible for the tips to be just the iridophores and pigments associated with protecting the corals tissue from the harmful UV rays of the light from the sun or our artificial lights, similar to us using sunscreen!
But this amy or may not be the case here!
Try moving your coral to a different place! How close to your lights is you seriatopora(birds nest)? _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Cerianthid Stars Hermits snails Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria Kenyon Tree Acropora Xenia Tridacna (CroceaMaximaSquamosa)
"IF THE PHONE DOESN'T RING...IT'S ME"  jb
associated content.com
aka parrothead
Last edited by coral reefer; 03-15-2008 at 09:58 AM.
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