Grey dusts over live rocks and live sand ?

[Lizzies2266]

Im not sure what this grey dust looking thing is that is covering all over my rocks and live sand. If i leave it on my rocks it hardens as days go on and its harder to get it off. Does anyone know what it could be? And how can i prevent this? Is this phosphate?

http://*******.com/r/3539tno/9

http://*******.com/r/j8cdfl/9

 

[Lizzies2266]

Www.*******.com/r/j8cdfl/9

http://*******.com/r/3539tno/9

 

[Jason9488]

What kind of website is that???? Pics won't load for me

 

[RussC]

Grey dust sounds like detritus. Completely normal. But you do want to manage it.

PS Website did not load for me either.

 

[Oropher]

I cannot load the Pics.

However could that be some kind of percipitation between Ca and Alk because of Mg deficiency?

Just a thought....

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