What are these things?

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cutter2001

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20260615_190428_F685C30C-0542-4872-ADE4-040BD8219ADF.png

Little white things. They are on my Duncan’s and rock work.
 
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mmorrison55

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I don’t think they pose any real risk to tank inhabitants and should eventually dissolve on their own, but I’ve read where others scrape them off with stiff brush or dental pick.
 

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