Can't keep montis

I am really baffled. I moved from the SF Bay Area to San Diego in March. Set up a new tank in April. My live rock sat for awhile but was still moist when I placed it in the tank. Added more new LR. My new tank is twice as large as my previous tank. I had four very large colonies of monti caps. One tyree green with purple rim, orange, another large green colony. I also had an assortment of acros that never grew in my previous tank. (My previous tank had no sump jus an HOB Eshopps with an Aqua Clear 70 I used for chemipure and phosphate reducing media). I bought a new tank added a sump, put on a large Vertex skimmer (people kept telling me I would have more success with a sump) use chemipure elite in the sump. NOW, my Millipora colonies are thriving and spouting new heads. I bout another large acro colony that had burnt edges and it is thriving and turning purple. I bought a red planet, same thing thriving.

My problem is my monti caps (and all other montis) fade lose color and perish. My beautiful colonies are gone. I've tried several different frags over the last few months and they all die. I tried digitata the same thing. Fade then die. I have checked for monti nudibranchs and can't find any. I dipped all the montis in Two Little Fishies Revive and that doesn't help.

I have green torch. acans, cyanarina, etc and they all do fine my lone clam that survived the move is growing now shell. I can't keep montis to save my life. I use the same MH lighting system I've used in the past with new bulbs. I have changed 10 gallons of water a week and still can't keep caps. Here are chemical parameters:

Salinity: 1.023
PH: 8.3
KH: 9
Nitrate: .10

It is strange people kept telling me it was impossible to keep the corals I was keeping without a sump. Now I add a sump and bigger skimmer and have far less success. I've also asked every major reef shop in San Diego for answers and they are all stumped.

Anyone have any ideas?
 
whats your calcium, mag, phosphate... need details on where you place them, flow, etc. montiporas are one of the easiest sps to keep. im not saying your doing something wrong, but its kind of odd that they keep fading and dieing and your other sps are thriving.
 
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