The white appears fiberous but lacks depth like tissue growth. It appears randomly and is very bright at first then fades so you can barely see it over a couple days. It happens at all depths and light conditions though usually more in lighted areas. I've been searching online for similar pictures/descriptions but haven't found any. I'm not concerned about it. More curious. Here is a closeup and then a FTS and its at the bottom right. Btw my tank is a 120g
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