Stn from the base or bites?

Luisreefmexico

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Hello
I recently detected some acroporas with blenching from the base
Colud you identify if it are stn or maybe someone is eating my corals?
alk:7.3
Mg: 1250
Ca:500
pO4: .17

52E60A7D-23BA-4819-82B2-5117FD83C3FE.jpeg 94BF32B8-D780-421B-BC00-82093B382B01.jpeg BE6DC396-0657-434A-AD59-21F514D5E1EA.jpeg E25DC55A-0113-47FE-8057-E35824F28F2C.jpeg
 
Hello
I recently detected some acroporas with blenching from the base
Colud you identify if it are stn or maybe someone is eating my corals?
alk:7.3
Mg: 1250
Ca:500
pO4: .17

52E60A7D-23BA-4819-82B2-5117FD83C3FE.jpeg 94BF32B8-D780-421B-BC00-82093B382B01.jpeg BE6DC396-0657-434A-AD59-21F514D5E1EA.jpeg E25DC55A-0113-47FE-8057-E35824F28F2C.jpeg
Looks to be a highly shaded area on the last two photos so that is the likely culprit. In the first two photos I can't say that I see an issue. Could be STN...
 

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