Is this STN?

[James-reefer2017]

This huge blue stylo has been in my tank for years from baby, I thought it’s a very strong,health and easy care one. This was happening a few days ago and I saw crabs keeping stick there eating the tissues. Seems each day gets more tissue off, Last year tank even got crash, the stylo got survived. Do someone know what’s going on? Any idea to save it? I checked all parameters all normal except ALk little high around 10, before around 8.50-9, my all other Acros which are more sensitive ones are all fine.

 

[AngryMike2016]

Looks like STN to me. I would frag off the healthier pieces and hope that those survive.

 

[James-reefer2017]

If it’s STN, there is no way to stop? Is it keeping spread? What I’m doing now is reducing ALk dosing and adding more Calcium dosing that is 420 around now.

 

[acropoora]

Looks more like RTN to me