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I believe this is a chemistry issue and not of one being eaten.
I did not change anything actually, this is one tank on my system and all other acans have no issues at all in the samr tank. In the systhem there are fish but in this tank there aren’t any only a urchin.What inverts do you have ? Have your parameters gone astray ? What fish if any do you have ? Did you recently dose anything ? Change in lighting ? Change in salt ? Water quality? Exhausted RODI ?
No peppermints in the tank, yes i also had this problem before with the acans and shrimps.Have any Peppermint Shrimp? I’ve had Peppermints go after Acans in the past.
No nopox or carbon, running on triton, temperature 25 and salinity 1.026 no changes in fact.Are you dosing :
nopox or any type of carbon?
amino acids ?
what are your ph and temperature readings?
salinity ?
Not really, it is not touching any other coral and i dont have amy fish or inverts who could harm the coral.Do you or anything else in the tank injury the acan in anyway? If so amphipods can and will cause this dyeing to happen. First they eat the dead tissue right to the edge of the health tissue damaging it so it dies and so on and so forth until the whole acan is gone. Been there seen that.
I tested magnesium that says 1450 1500 salifert. A few weeks ago my calcium dropped to 390, but strange thing is i have a few acans and only one has this problem.Check your MG, mine were looking bad, ready to remove them until I tested MG, it was low. They’ve rebounded.
Yes calcium dropped , but not that much, to 390 istead of 450That looks like progressive tissue recession. I would expect a more random pattern of damage if something was eating it...
Maybe a parameter swing in the recent past?

