Brown substance on Zoos?

thejiro

New member
I just noticed on one of my zoo frags I have had a polyp on the back that wasnt opening. SO i picked it up and looked at the polyp and noticed what looked like a brown substance growing on the polyp. The brown has spread to the base of a few other polyps close to it, they are open and happy though. I can also see where one polyp melted and used to be.

So my question is what should I do?

Thanks
Ken
 
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