cocoon on LR?

Dennis1438

New member
My tank has been running for a few months and in the past week I have noticed several small white cocoons growing on the LR. Right now they are different sizes and look cone shaped. Looks like tightly woven fibers sticking in all directions. Does anyone know what they might be.

I am trying to attach a photo but having problems. Will send one as soon as I can.
 
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