GSP that isn’t green.

[AllSignsPointToFish]

probably too much zooxanthellae then, if it went green to brown

Possibly, but I did notice a correlation between greenness and how often I bothered to dose iodine.

Regardless, as long as the OP doesn't overdo it, it's harmless to try.

 

[AllSignsPointToFish]

Probably was a mistake, but I purchased a frag of GSP from my crappy LFS. The GSP had zero green on it whatsoever. The polyps are a creamy tan color. The polyps come out and look full and gorgeous. It’s been in my tank about a week and I haven’t noticed much change. Will it ever turn back to green? I have zoa’s and a trumpet coral that are doing just fine, all levels are where they should be.

Have you tested your iodine levels? Just curious what they are running. My always run about 0.06 ppm.

From the Red Sea Iodine Test Manual:

Trace-Colors™ Iodine+
Complex of halogen elements

Main elements
Iodine, Bromine and Fluorine

Test for dosing
Calcium or Iodine

Function
The halogens act both as antioxidants and oxidative agents within the soft tissue and mucus layer of corals, reducing the possibilities for coral bleaching. In active reef systems these elements are depleted very quickly due to their high oxidative abilities and reactivity with organic materials.

Coloration
Iodine and bromine are related to the pink chromo-protein (pociloporin)

Level in NSW
Iodine 0.06 ppm; Bromine 65 ppm; Fluorine 1.3 ppm

Overdose
Halogens can have adverse effects on the soft tissues of corals and all micro-fauna. Common indication of overdose is a severe regression of the soft tissues of hard corals and pale colors in soft corals. In case of over dosing change 50% of the water and reduce the supplementing dosage by 50%.

 

[Dj City]

Iodine will NOT turn those star polyps green because they are NOT GREEN star polyps.

Please don't go messing your tank up trying to turn a frog into a princess.

 

[MSB123]

I would just get rid of it. Not a good coral later in the tanks life.

 

[Oshengems]

My Xenia is my meter for Iodine, it shrinks when it’s low and it’s nice a plum extends more when I add Iodine

 

[Oshengems]

I would just get rid of it. Not a good coral later in the tanks life.

And this I’m now scare of this stuff it spreads like wild fire in CA, I had some on my sand and it created a mat that actually touched one of the rock and started to creep up luckily got it early and put a bit of puddy over it to kill it before it spreads but it does give your tank some character

 

[Dj City]

It's pretty easy to control but takes a little work and planning.

First, ISOLATE it from anything you don't want it overgrowing. Place it on it's own island.
Second, if it does start to get somewhere you don't want it, just take a toothbrush and brush it. It will disappear where you brush it.

Look at my 3 pics in order and you will understand what I mean.

This is a pic from about 3 or 4 years ago. The GSP was just starting to spread to the weir.
If you look CLOSELY you can see that I had the same the Star Polyp you have. It's right next to the Carper anemone.

Check my avatar pic. GSP grew on my Weir and rock around my weir. This pic was from about 2 years ago (I think).

Avatar pic

The pic below is from last month.
You see how I have the GSP in check?

The whole thing started from this...