I agree with Brad....there is one thing that we all need to realize and doing so will save a lot of us a lot of stress and hair pulling..... we take corals from the four corners of the earth.....different oceans and seas, different conditions.....we stuff them all into one tiny little box and expect them ALL to be happy....this IMHO is impossible.....personally, I have never run a tank where EVERY coral in the tank was 100% happy 100% of the time.....if 99% of the coral is doing great, then dont mess with your params....perhaps a re-location of Mr Grumpy is all that you need(like to my tank
).....you said you were adding flatworm stop, maybe thats the culprit?
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694