4 month old 120 reef tank with patchy stringy dino on substrate. 3 days ago decided to dose metroplex to get ahead of it. Morning after second dose tank was extremely cloudy. That evening a large old colony of green slimer from previous tank developed RTN. This morning it has progressed quite rapidly....... this is a very stable tank in every way otherwise. I'm perplexed and very saddened. Only other colony that seems affected is an large old colony of stylophora. Normally the polyps are very well extended but are now fully retracted.
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