Possible bacterial infection taking out my SPS

[SPotter]

I have been losing SPS for the last week now. They begin to STN in the middle of the branches and then a day later totally gone. I can have two frags next to each other and one looks great while the other is a total loss.

Here are my params...
Alk 10 dkh
Ca 430
Mg 1300
N03 0-5ppm (salifert)
P04 .08 hanna ulr checker and <.1 on salifert
Sg 1.026
Ph range 8.05 to 8.20 daily
temp range 78-79 daily
Salt Tropic Marin Pro Reef

My LFS says it might be a bacterial infection so if that is the case what should I be doing?

Coral RX dips, large water changes etc. Any and all suggestions as well as questions for additional information are greatly appreciated.

 

[Red_Blenny]

Do you have a test kit for Iodine? It's pretty easy to OD on iodine IMO.

Are you using lugols or just iodine. I heard there's a difference (lugols has potassium) but not too sure about it. Maybe someone who dose iodine can chime in.

 

[SPotter]

Do you have a test kit for Iodine? It's pretty easy to OD on iodine...

I do but havent tested in a while since I dont add iodine. Should I still test for it?