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Yes it does not blow off when I tried rubbing it off with hands is it dangerous.Nothing to worry about. Not any pest or whatever to worry about.
Might be calcification. I bet it doesn't blow off, and is stuck.
Might be sand too as mention but it's getting bound to rock if it doesn blow off.
If it's bacteria as mentioned that's perfectly normal too.
That rock will change many colors and all kinds of spots as is ages and gets better and nicer looking, with more coraline, algae, and lots of good life.
Start to worry if you see bubble algae or Aptasia coming/growing on of rocks. Even that can be dealt with (sooner the better)
Nope, not dangerous at all. Unless the specs move on their ownYes it does not blow off when I tried rubbing it off with hands is it dangerous.

Thank youNope. Unless the specs move on their own
Enjoy your tank and rocks.

