White blobs on new lava rock

Afterburned

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So my tank is just starting its cycle and new plants etc are arrving in dribs and drabs - I go this lava rock 2 days ago, washed it and put it in.
Now it has these white blobs appearing - should I be concerned and what are they?
Sorry pics aren't great, not read the bit on tank photography yet!
Cheers,
Afterburned
 

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I had something similar to this on my spider wood when I first put it into my tank. It went away after a few weeks and didn't seem to affect my fish. I saw somewhere that cory catfish would eat it. It might be a type of fungus? I am not 100% sure though.
 

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