Looking for some advice

[hummer]

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