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White Growths on Silicone


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I have a 30 gallon that’s close to a month old and for most of its time it’s had white growths on the silicone but nowhere else in the tank. I know it’s not calcium. My guess is it’s either bacteria colonies of fungus. Doesn’t seem to be harmful. I have a 10 gallon and this doesn’t happen and I find it odd that it happens in one but not the other. Does anybody know what it is? I’ve attached a photo.



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