Yellow Polyps turning dark?

[RLG2182]

Well... I have a rock of colony polyps that were once BRIGHT yellow, and now they're turning pretty dark. (like a dark colored mustard). They're about at the top middle of my tank and have medium flow.

Water conditions: 0/0/0, PH at 8.1, Alk at 3.5 meq/L, CA at 390 ppm. Temp at 80F, sg at 1.025.

Feeding: formula 1&2 every other day, Cyclop Eeze & DT's Phytoplankton only twice a week.

Should I be giving this thing trace elements like iodine? I recently switched to Oceanic cuz my CA and PH were junk with Instant Ocean. Going to do a water change this week... last water change was a 20% two weeks ago. These polyps have been looking this way for the last week, and I've had them for at least 3 weeks. Suggestions? Thanks!

Placement:

Before:

After:

 

[steve-s]

Browning is usually a sign of insufficient lighting. Parazoanthus in general appreciates a fair amount of lighting and will dull over time with less than adequate lighting. 4x65w PC is not an abundant amount of intensity on a 75 gal tank.

Even though they may contain zooxanthellae, all types in this family will benefit from direct feedings. You could try moving it a bit higher as well as taget feeding and see if that helps.

Cheers
Steve

 

[melosu58]

When I had some I would target feed mine with some brine shrimp. It seemed to do the job. Like Steve said maybe this will help. Have a good day