SPS whitening and polyps hiding. PLEASE HELP!!

nelcadiz

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Well I've been with it since I started dragging the summer with some SPS (Montiporas digitatas, Montiporas plate and acroporas) that I removed the polyps have stopped growing or whitening, however other sps as milkas, Pocilloporas, and other Montiporas seriatoporas digitatas are well and growing. At first I thought it might have been the heat and density, as in some summer days the aquarium has been at 29 degrees and a maximum density of 1021 to 1022, but about a month ago is already being corrected maximum temperature of 27 degrees and a density of 1024 (I take it to 1025 it was originally). I leave today data taken
Po4 0.00 (Hanna), 0.00 No3, 7.7-8.00 Ph, Kh 7, 455 Ca, Mg over 1500 (I consumes very little).
I do water changes with sea water every 15 days approx. of 10%, and UV sterilizing filtrádola with a sock 150 micron and activated carbon, corals alimentoa nightly with phyto Easy coral reef and vitalizer alternate days, the fish twice a day.

I do not understand what is happening, as most corals are fine and the settings are correct.
 
I have some photos of some cuttings and pieces, with the prior with parameters (I have a journal where I document everything) and now photos

Acropora tricolor, 31/07/2012 kh 16.8, ca 250, mg 1350, densidad 1022
DSC_5832.jpg



Acropora hoy 17/09/2012
DSC_5844.jpg



Montipora digitata naranja 31/07/2012 kh 16.8, ca 250, mg 1350, densidad 1022
DSC_5821.jpg



Hoy 17/09/2012
DSC_5841.jpg



Montipora digitata 03/05/ 2012 kh 16.16, ca 300 mg 1320
DSC_5580.jpg



Hoy 17/09/2012
DSC_5842.jpg


So some more cuttings, without mebargo others are great and growing by the day as milkas other montis digitatas ...
 
The tricolor I would bet has aefw try dipping in revive and see if any pest come off it... The other 2 digi and pocci is just the bone structure.. The white tips mean there growing and doing well...
 

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