under the sand question

[Humuhumunuku]

I just assume, in the event of a decent quake, my tank is screwed.

 

[kingevil]

Use of eggcrate prevents some sand sifters from doing their job!

yes good point!

 

[MaxxedMan]

Eggcrate, then 4 inches of sand, then rock. I'm too cheap to bury rock under the sand as a support. The way my diamond goby digs I may regret that. Regardless, the eggcrate will prevent any rockslide from cracking the bottom of my tank.

That's what the very cheap base rock is for

I had a maroon clown that loved to dig himself a den. My rocks were on 4" of sand. It was hell. The entire structure would collapse, I'd fix it, he'd do it again. I went to the bottom this time, too much of a pain otherwise.

Rocks on the bottom of the glass have no where to fall to. Rock slides from higher rocks should land on your sand and not the glass, and they are falling in water. Has anyone experienced a bottom breaking rockslide personally?

 

[Dr. Reef]

direct sand and rock on glass