Help! why is sps bleaching from the bottom?

[Cubbies]

We got a frag of Blue tip acropora tenuis and noticed that part of the bottom has gone white. The tips are still blueish purple and we see some polyp extension. What could be wrong? This is our first acro sps, we really dont want to kill it

 

[ColaAddict]

Can you post your water parameters and type of lighting you have and positioning of the SPS in your tank.

 

[MMreef]

SPS are very sensitive to rapid changes in water chemistry.It may be a shock from moving it from one system to another with different parameters.If it is a new frag don't put it high right away,start at the bottom first and move it up gradually .Make sure you have nice flow in your tank,as SPS need high flow.