What is this on my sand bed

[Rscott]

sorry to start a new thread but came home and found this

This is not diatoms I believe?

120 gal
2.5 weeks into Red Sea reef mature cycle
Kit

Was struggling with some test kit readings being wrong hence my other thread and now just found this in the tank

 

[lapin]

Either diatoms or algae. Thats my guess

 

[Rscott]

Either diatoms or algae. Thats my guess

Thanks for your thoughts

 

[Leslie Tabor]

It looks like the normal stuff that shows up on the glass under the sand. No need to worry, just clean.