Dry rocks on top of sand

[rsach]

Is it a bad idea to put in sand first and then the rocks? I was planning to do it in this order to protect the glass, but have read some comments regarding critters digging underneath and causing rocks to tumble.

 

[ThePurple12]

It shouldn't hurt the glass.

I would put the rocks in first just in case you decide to get a digger.

 

[malacoda]

If you plan on getting pistol shrimp, jawfish, or large gobies that burrow a LOT, it's safer to put the rock on the glass. If you won't have any critters that will do widespread burrowing ... and you use large rocks for the base of your rock piles, then you should be fine putting them on the sand.

 

[Billdogg]

Rocks, then sand. Even if you have not got any diggers/burrowers, over time even the flow from your power heads can cause the sand to shift and allow the rocks to fall.