Bleached tips

[cilyjr]

I'm guessing there is more than 1 factor going on here.

What light do you have? There is a big difference in t5 fixtures.

What are tank numbers? Fine as an answer will not help us help you.
And how are you measuring these?
Salinity (sg will be fine)
Alkilinity .....8 to 8.5 was stated by a 3rd party
Calcium
Nitrate
Phospate
Magnesium

How are we supplementing and how often? How do we know we need to be adding said supplements?

How old is this tank?

Finally

how the tank crashed 3 month ago?

Details here please...

The pictures suggest there multiple corals effected at the moment but it's hard to tell with the picture quality.

Answering this might give us more insight to the issue.

The 1st picture of the effected coral looks like an A. Lokani (again hard to tell). This is not a coral I would suggest to one who has not been running a stable tank for a while. Not having auto freshwater topoff to replace evaporation does not suggest an environment of stability for the more sensitive acropora.

 

[Bostoncoral]

how the tank crashed 3 month ago?

Had a cal reactor running... and went away for a day...when i came home, it was running full power! Ph dropped

 

[dz6t]

Do you have these acro before or after the incident?


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[Bostoncoral]

Aquatic life t5 w ati bulbs on 9 hrs a day.
Reef chrystals
Test 2 to 3 times a week red sea test kit for cal and dkh
Salifert mg test kit
Idk if u can read my log but ill try and post it.
I dose brs cal chloride and brs sodium bicarbonate manually about once a week manually.
Im still learning and this is my first reef tank so im kinda in over my head but just wanted to see what i could do w the acros. The tank will be a year old in april.

 

[Bostoncoral]

Do you have these acro before or after the incident?


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No

 

[Bostoncoral]

Log. Idk if this helps? Its not very specific on details

Thanks for the replys guys