Hello, I am just getting back into the hobby after about 10 years, and I have just set up a 30 gallon corner tank. It's been running for about 2 weeks, no fish, and I used a bit of food to start the nitrogen cycle. There's a large piece of driftwood and a rock that was labeled petrified wood at the LFS, and there is some white, fuzzy stuff growing on just the rock. It doesn't look like any fungus I've seen before. Has anybody else had this (picture attached)?
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