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Earlier this week we noticed white stringy stuff on the side of our tank. The next day it was all over the gravel of our aquarium. We had a panda Cory pass away about a day after that. Earlier in the year we had an outbreak of columnaris, but mostly saved our tank. We removed the infected fish and treated with trisulfa. We have had danios and harlequin rasboras live happily in the tank for several months since then. The original symptom of columnaris was only the rotting of the mouth, we never saw anything else. I read online that the white strings might be another sign of columnaris. Is it possible that it has come back?