frogspawn bleaching

[e46er]

i have a 120G with about 3000 G an hour going thru it maybe more im not sure what my CL is running at

i got a frogspawn 6 months ago and had some HA issues and he was thriving lotsa color and quite large
now the HA i took care of 2 months ago redid rockwork ect. and replaced my 150w MH also started vodka dosing.

now he is bleaching out and overall not happy i thought maybe it was a light or flow issue so i moved him to 3 different heigths and 3 different spots to check if he was unhappy with the flow over the past 2 weeks he has just gone more white and shriveled up any thoughts or ideas?
i have other LPS and SPS that are doing great and fish are all happy..............im confused

kh 9 dkh
ca 420
mg 1400