Looking for some advice
 

I have a mix of lps and sps. My frogspawn broke into 2 pieces yesterday so I stuck it in an open spot on the left. Today the big brown acro at the very top started to turn white on one side. I've had it for over 1 month and was doing great. Are they too close together? I also have 2 BTAs that split 3 times each. One piece has started to climb. Should I be trying to move them further away? Anything I can do to save the acro? Thanks for your suggestions!
Parameters:
4 strip HO-T5
Salinity: 1.025
Calcium: 400
Mag: 1365
Alk: 2.6 <- Alk/KH are a little low. Adjusted it today.
KH: 7.25
Nitrate|Amnonia: 0

http://www.canreef.com/photopost/data/508/tank9.JPG
http://www.canreef.com/photopost/data/500/Acro.JPG

While Frogspawns can have quite a reach, that one doesn't look like it caused the whiteness you are seeing. Without seeing a better pic of the acro, it doesn't look like the acro is in serious decline to my eye.

However, the Frogspawn will certainly get larger and will start to damage those acros eventually.

More immediately, the BTA is more likely to damage the acros.

I added a close up of the acro.
Thanks