Bleached coral and STN

[ratm909]

Hi,

Well, Im almost a year in reefing and have done another large mistake

I did two 20% water changes back to back with a new salt and seemed to have bleached and caused RTN to my most prized coral. It was a very large colony of acropora that an aquarist sold to me for very cheap.

Its going down fast, should I consider taking it appart for frags? Or is there anything else I can do to save it?

Please see pictures, it was thriving before the salt change

Thanks!



Sent from my iPhone using Tapatalk

 

[scar79]

Two 20% water changes should not cause trauma unless parameters were out of line. Water up to temp, aerated for pH, big three inline with your usual values?

EDIT: just re-read and saw new salt. What did you switch from and to? previously asked questions still apply!

It definitely not looking happy, but I'd say it has a great chance of full recovery if you can identify and correct any issues fairly quickly.

 

[ratm909]

- Big three stable / kalkwasser top off / 420/9-10/1400ish

- Temp is good water always aerated

- new salt not inline with with current params (switched from Red Sea coral pro to aquaforest reef salt, have done this in the past but not with this SPS in tank)

- also worth adding that in that same week I added purigen for the first time to the tank.

- another thing I noticed, is when I give it reef roids , the polyps don't secrete as much white stuff anymore

If I could make it survive As is , I would be soooo happy.




Sent from my iPhone using Tapatalk

 

[Mr.Fishtank]

With switching from red sea pro with 12+ dkh to aquaforest that only has a dkh of around 7.8. I would think that the coral did not like the drop in alk. Also my last two bucket of AF reef salt have been way off from what their paper stats it should be. Alk tested at 7.1 dkh and calcium was at 500+ @ 35ppt

 

[danrobberg]

Is it the aqua forest probiotic salt? I use tropic Marin bio actif salt me it has a carbon source lr easy included in the salt which I believe the aqua forest dose as well. This could have caused a drop in nitrates and phosphates that was to dl fast and the coral didn't like. I've had problems in the past with using gfo to lower phosphates. It lowered them too fast and my sps did t like it and looked like your acro colony.

 

[ratm909]

No it's the normal salt, i will probably switch to the probiotic one or back to Red Sea. Not sure yet. Their params on the lot test are accurate in my case.

Anyways, the bottom part is almost gone, Im going to have to frag it. The top part (there are two separate colonies) is recovering well.

Has anyone noticed brown stuff at the bottom of the mixing tub with this salt? I noticed last time when I emptied the rest of the bucket in the sink. But I had also added alk and cal to it so that might be why.


Sent from my iPhone using Tapatalk