OMG, my Acropora got White

ali.farzinrad · Dec 24, 2015

Hey everyone
I'm new in SPS keeping, I bought 2 Acroes, one is large and a medium size, the smaller one got White in just 2 days but thanks God that the bigger one is good and healthy ( at least I think it is).
What may cause this?
Mg 1650
Ca 580
Low NO4 and PO4
Kh 7/3-8/3
PH 8/1

RalphsReef · Dec 24, 2015

Your calcium, ALK (kh) and magnesium are a little out of whack. CA should be around 420, mag 1200-1400, and ALK should be at 8 at the lowest. Are the polyps extended on the piece that turned white? If they are, it may be able to be saved. If no polyps are extended, it may have RTN'ed, in which case it is a goner. Make sure your ALK is stable.

Shep · Dec 24, 2015

Bleaching would be my first guess and a pic will help a lot

ali.farzinrad · Dec 24, 2015

RalphsReef said:
Your calcium, ALK (kh) and magnesium are a little out of whack. CA should be around 420, mag 1200-1400, and ALK should be at 8 at the lowest. Are the polyps extended on the piece that turned white? If they are, it may be able to be saved. If no polyps are extended, it may have RTN'ed, in which case it is a goner. Make sure your ALK is stable.

How can reduce MG and Ca and how should I stabilize KH?
And I have to say that it is all gone, nothing's left.
I happened is just near 30 hours!!!!

ali.farzinrad · Dec 24, 2015

Shep said:
Bleaching would be my first guess and a pic will help a lot

I don't think it's bleaching, cause my light is not that strong, and why it just happened to this one?

TUSI · Dec 24, 2015

RTN. most likely cause your numbers are out of wack.

ali.farzinrad · Dec 24, 2015

TUSI said:
RTN. most likely cause your numbers are out of wack.

What is RTN????

reefwiser · Dec 24, 2015

This can happen it just a few hours RTN is something that happens to SPS. It can have many causes. I have had it happen after a water change or similar water chemistry event. I change of filter media can cause it to happen. It's part of keeping SPS. I have been keeping SPS since the early 90's an we started fraging corals to try to save pieces when they did this years ago. I have the best luck with bases of corals that RTN upwards. I cut off the top and the base grows back.

ali.farzinrad · Dec 24, 2015

reefwiser said:
This can happen it just a few hours RTN is something that happens to SPS. It can have many causes. I have had it happen after a water change or similar water chemistry event. I change of filter media can cause it to happen. It's part of keeping SPS. I have been keeping SPS since the early 90's an we started fraging corals to try to save pieces when they did this years ago. I have the best luck with bases of corals that RTN upwards. I cut off the top and the base grows back.

What is RTN?
I fragged the white part when I saw it, but at morning I saw it has some more white and at night when I returned home, it was all as you see in the pic.

Shep · Dec 24, 2015

ali.farzinrad said:
What is RTN?
I fragged the white part when I saw it, but at morning I saw it has some more white and at night when I returned home, it was all as you see in the pic.

Rtn is rapid tissue necrosis.

CoralNerd · Dec 24, 2015

Rapid Tissue Necrosis (RTN)

reefwiser · Dec 24, 2015

Rapid tissue necrosis.

http://reefbuilders.com/2013/06/05/rtn-sanjay-joshi/

Yes I have had it happen over night.

I have had a whole tank do it. [emoji3]

Pete polyp · Dec 24, 2015

I had a frag rtn last night too [emoji22]

ali.farzinrad · Dec 24, 2015

Pete polyp said:
I had a frag rtn last night too [emoji22]

I think I had to frag it 1 cm more, it started from left side, I cut it exactly near the white area, I think I had to cut some more

Sabellafella · Dec 24, 2015

Pete polyp said:
I had a frag rtn last night too [emoji22]

My rommels rainbow rtnd last nite also bummer

Pete polyp · Dec 24, 2015

Sabellafella said:
My rommels rainbow rtnd last nite also bummer

Bummer is right. Mine was iron patriot acro

reefwiser · Dec 25, 2015

RTN is such a tough thing. The coral looks great when you go to bed then when you wake up its white. Fragging is your only hope and sometimes that doesn't even help. Lost a tri colored acro frag yesterday after a month in the tank. It started at the bottom of the frag I cut it at the top but it didn't help.

Pete polyp · Dec 25, 2015

reefwiser said:
RTN is such a tough thing. The coral looks great when you go to bed then when you wake up its white. Fragging is your only hope and sometimes that doesn't even help. Lost a tri colored acro frag yesterday after a month in the tank. It started at the bottom of the frag I cut it at the top but it didn't help.

Sometimes you can glue over the parts that have rtn and it will keep it from spreading. The thing about rtn is that something is wrong and the rtn will continue until the problem is fixed. There are 99 reasons for a coral to rtn so it's not always possible to save the coral. It could be that specific coral doesn't like something and in that case you probably can't save that one. I always look at the parameters if one rtn to see if a correction needs to be made to save all the others. I think my frag rtn because I moved it to a higher flow and higher light in my tank. Everything else is doing fine and all the numbers are where they should be.

ali.farzinrad · Dec 25, 2015

Pete polyp said:
Sometimes you can glue over the parts that have rtn and it will keep it from spreading. The thing about rtn is that something is wrong and the rtn will continue until the problem is fixed. There are 99 reasons for a coral to rtn so it's not always possible to save the coral. It could be that specific coral doesn't like something and in that case you probably can't save that one. I always look at the parameters if one rtn to see if a correction needs to be made to save all the others. I think my frag rtn because I moved it to a higher flow and higher light in my tank. Everything else is doing fine and all the numbers are where they should be.

My Mg and Ca is a little bit high, how can I reduced them?