Coral browing out

[JT3069]

Background 75g tank 2x250w 14l pheonix mh 2t-5
swc160 skimmer, tlf phosphate reactor, miracle mud in fuge
4'' sand bed,

my question is i have 1 piece of coral that is browning
i have a tri color that is turning blue and green
and very slow growth

all para seem to be in check i do 2 5g water changes a week

also have red milli that is green on the tips

any ideas?

 

[JT3069]

Anyone?

 

[surfjeepzx]

Browning is typically phophates. Although you're changing water regularily you may be producing more phosphate than you are removing. Get an accurate reading on your phosphate levels with a Hanna style checker. In the mean while do a very large water change.

 

[JT3069]

I have rechecked my phosphates and they were .03
i don't think that is my problem
does uv radiation have any effects like this

 

[JT3069]

Reason i say this is i have de bulbs and my glass broke(odyessy fixture go
figure) shortly after i got it, and have been doin fine for 2 months now
p.s. I have ordered the glass was hard to find and had to have glass shop make it