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What is this stuff growing on my rocks?

817 views 4 replies 4 participants last post by  mosspearl 
#1 ·
As the title says. I set this tank up about a week ago. Currently there are only four fry in this 10 gallon tank, which has a sponge filter and a water temp of about 80 degrees. I just noticed this odd looking stuff growing on the rocks I put in there, any idea what this is?



 
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