Monti turning brown in areas

[rich19020]

For the last couple of weeks my two red montis are beginning to have brown spots which turn eventually white. The rest of my tank seems fine, which has other sps corals in it.

Salt 1.025
Temp 78
Alk 10
Calcium 420
Mag 1330
NO3 between 1-10
Phosphate between 0-.100 (depends on the day)

Any ideas what would be causing this? I did increase the flow. I have a 72 gallon bow front 40 gallon sump and a 30 gallon refug. I run Calcium reactor and GFO in a reactor.


https://skydrive.live.com/redir?resid=D274D15BB85C4405!1032&authkey=!AN4d8_TNc9MOGB0

 

[rich19020]

sorry forget to mention I run mp40 at 75% and a mp10 at 85%.

 

[rich19020]

anybody?