One SPS browning others look great

[Chris Spaulding]

I have one SPS that over the last couple days that is starting to brown. I have this piece in 2 different locations and both are browning.
Salt — TM Pro
Alk steady ——— 7.8 Hanna
Po4 up a little from .03 to .07 Hanna ul
NO3 — detectable about 1-2 Redsea
Ca — 447 Hanna
Mag — 1380 RedSea
Lighting Photon V2 about 400 par at both spots ,No Change in lighting in over 6 months
I dose TM AFR and have been using for over 14 month.
about 1.5 ml a day of Brightwell ammio
Feed Easy reefs SPS and Easy booster 4ml a day each over a 24 hr period
PH fluctuates from 7.9 too 8.3 through the day
Salinity 1.025
Dose 2ml day Flatworm stop as preventive.

Top one brown with light purple tips was more mint Green with light purple tips.

 

[X-37B]

I have had corals brown out for a couple months for no apparent reason.
They then color back up.
The rest of your tank looks good.
Watch that long spine urchin. I had to remove mine as it started eating coral.
In the process of removing all emerald crabs as the have stressed corals too.

 

[Chris Spaulding]

No emeralds or other crabs just lost of snails. And yes I watch the long spine and he has damaged a small frag or 2 but he also does a good Job keeping algae away.I have had him for almost 2 years. I just noticed that coral browning and haven’t changed a thing in my routine. The only other thing that I have fluctuating is Temp from 76 to 80 then to 77.

 

[Pistondog]

light would've been1st guess. Po4 2nd, but I'm no sps expert.

 

[X-37B]

No emeralds or other crabs just lost of snails. And yes I watch the long spine and he has damaged a small frag or 2 but he also does a good Job keeping algae away.I have had him for almost 2 years. I just noticed that coral browning and haven’t changed a thing in my routine. The only other thing that I have fluctuating is Temp from 76 to 80 then to 77.

One thing i have learned in this hobby is sometimes things happen to corals and we never really know what the cause was.
What do you think and how long have you run the flatworm stop?
I started it about 2 weeks ago for preventable measures too.

 

[Chris Spaulding]

I have been running Flatworm Stop for about 6 weeks so I guess you could say that this was a change in my routine. Hmmm maybe stop and see if color returns

 

[Chris Spaulding]

light would've been1st guess. Po4 2nd, but I'm no sps expert.

Have not changed light setting in over 6 months and even then only 2% every other week. Po4 did raise from .03 too .07 but that could have been from harvesting Marcos from fuge

 

[X-37B]

I have been running Flatworm Stop for about 6 weeks so I guess you could say that this was a change in my routine. Hmmm maybe stop and see if color returns

I just checked my log and I have been running the flatworm stop for a month with no noticable issues.
I run 5ml a day in my 120.