Some acros have white tip, I think growth?

BYU

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looks like new growth to me
you nutrients are not bad at all
just wait and see don’t cut it
B86700BF-5B8B-4992-8209-8EF023958B9B.jpeg
A1FBCA0E-5F65-4A96-A2CD-5A102B6CEE2C.jpeg
 

schuby

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Are you measuring phosphate with Hanna phosphorous checker? The one that reads in ppb? What is the ppb value from the meter?

Your alk at 9.5 is not super high, but it is high. If your phosphate is normally 0.03ppm, then that is quite low. High alk + low phosphate = burnt tips on SPS (due to skeleton growing faster than skin/tissue).
 
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Are you measuring phosphate with Hanna phosphorous checker? The one that reads in ppb? What is the ppb value from the meter?

Your alk at 9.5 is not super high, but it is high. If your phosphate is normally 0.03ppm, then that is quite low. High alk + low phosphate = burnt tips on SPS (due to skeleton growing faster than skin/tissue).
Yeah I'm measuring with phosphorus then convert to phosphate.... so.. I need to up to phosphate? I find it strange its only the PC Rainbow
 

Saltyreef

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I hope im wrong but there seems to be flesh coming off from the sides of the tips. Not white growth at the tips themselves.
This screams STN to me.



Screenshot_20201024-153222_Chrome.jpg
 

Brian_68

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I hope im wrong but there seems to be flesh coming off from the sides of the tips. Not white growth at the tips themselves.
This screams STN to me.



Screenshot_20201024-153222_Chrome.jpg
Agree something does not look right my pc rainbow growth is just a lighter shade never white.
 

jeffm

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Unless the white is moving down I would wait. My bet is new growth.

Pic of my PC rainbow and TGC Starfire (not sure if it’s same/similar to RR) New growth (white tips) is more pronounced in some areas. Pretty standard.

01E109D6-4806-42C8-87D9-17401CBC6CEE.jpeg
 

schuby

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New growth, as in @BYU 's pics, is uniform and the whole end is extending. In your first pic, you can see the sides are inset, non-uniform, and white where the tissue has peeled off. Peeled sections will next turn brown as algae starts to grow. The coral can reclaim the bare skeleton if it starts growing again.

Why the PC Rainbow? Nobody knows. IME, it rarely stays with just one.

Yes, I think you should not have such low values of phosphate. The way to raise it is to not remove so much. What do you do to remove phosphate in your tank? GFO, carbon-dosing, lanthanum chloride, macro-algae, ATS, ...
 

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