For the past two weeks I've been having problems with tiny brown strings stuck on the skirts of my zoas/palys. I know they produce waste that comes out in strings but they appear be stinging the skirts. A lot of the skirts are folded up where the strings are and some even look like parts of the skirts have receded. Does anyone have this problem? I've always seen waste being produced by my zoas/palys but never to the point where it effected them negatively.