Why are my Monti's bleaching?

[PDAlber]

I have several Monti's in my tank. Recently, one of the smaller colonies, started bleaching. Now, two more colonies, a tan purple rim, and a small green, are starting to bleach.

http://i353.photobucket.com/albums/r376/fisheriff/monti1.jpg
http://i353.photobucket.com/albums/r376/fisheriff/monti2.jpg

My paramaters are: Alk 9.3, Calc 400, PH 8.0, Phos. 0, Nitrate 0, Nitrite 0. SG 1.026. I'm running a 6-bulb Tek light with 6-month old bulbs. I haven't changed anything, other than adding some frags, and all my other corals appear fine. Any suggestions? I'd really hate to lose them.

[1DeR9_3Hy]

Nudi's? Do you do any preventative work on new corals (I ask because you mention new frags recently)?

[sanababit]

check for pests, maybe a strontium or alk issue, good luck

sana

[sedor]

I'm going to go with some sort of pest as well, considering the biggest change has been the addition of new frags.

[PDAlber]

I'm worried about it being pests. While I QT new fish I have not been doing so with coral. Is there anything I can do to combat parasites if they have already been introduced?

[DJREEF]

U f*d up. Classic nudi (AKA cooties) infestation. Take evasive.

DJ