Duncan slime, brown jelly? What to do?

[d.hedrick]

This Duncan has been an issue since I put it in my tank. Won’t open and is now covered in some substance. Any suggestions as to what’s going on?

 

[ZiBiReef]

When did you add it? What part of the tank is in? Did u acclimate to the light? How are your other corals?

 

[Pntbll687]

What are the parameters of the tank? Alk, ca, salinity, nitrates.

My duncans don't like my frag system which runs a little higher alk, usually 10. They love my lower alk, higher nutrient display which has alk of 7.5 and nitrates around 30

Can you blow the stuff off the duncan?

 

[Scorpius]

That's Brown Jelly Disease. With as advanced as it is I'd toss it before it spreads.