What is thissssssss!!!!!

[gexmixi]

This appear in like 9 hours, they are like yellow-green spots on the sand and a little in the rock, what are they? Im new to this, can see what i have in this post: http://www.nanotank.com/forum/viewtopic.php?t=6779

and this is what appear:

 

[JakeKM]

Looks like a diatom bloom, should go away once the tank has matured. I see that this was posted a few weeks ago, has it cleared?