STN from base up

[uhupong]

Double check you test with someone’s kits

Thanks. What would make this happen?

 

[joseserrano]

Thanks. What would make this happen?

Improper storage, contamination,....

 

[Travis Stewart]

I’m thinking aefw if you ruled everything else out

 

[CoralClasher]

LOL you can see the differences in pic above between tip, and sides of the colony.

What your opinion ?

The reason for the white light is so we can see the other algae that is growing.

 

[uhupong]

The reason for the white light is so we can see the other algae that is growing.

No algea.. SPS color fade

 

[Gordonm]

Things happen occassionally

 

[Dom]

Nothing in that photo looks like RTN to me.

 

[ScottB]

A mature biome and solid parameters, so I guess a few things to explore:

a) ICP as mentioned
b) Pest check. Remove and do a 10 minute dip in potassium chloride. Inspect under light and magnification.
c) I had something similar with just a few varieties of acropora. In the end, I went with a long dip in amoxicillin which seemed to arrest the STN.

I may have missed it. Did you do a pest check? Have you sent out an ICP? Pull a colony and inspect under a lit lens looking for bite marks, EGG clusters, and critters. Dip in your favorite dip (as long as that is Revive, CoralRX, Bayer, or KCl).

Your numbers are fine; you need to work down the list. Order ICP first and then inspect while you wait.