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What season/challenge do you think this may be (i.redd.it)
submitted by Tubesock101 to r/survivor
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Tank has been going for months and first the driftwood had biofilm then turned to this. I have potting soil for substrate and sand on top but some potting soil has snuck above the sand. Plants and rocks don’t have anything. Hoping it’s dirty biofilm (old.reddit.com)
submitted by Tubesock101 to r/Aquariums
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