Do Sand And Gravel Mix?

[sbga]

I'm setting up a new tank and am interested in having mostly gravel substrate, but a small area with sand for fish like kuhli loaches. Will the sand stay seperated from the gravel, or do I have to have some kind of serperator? Thanks

 

[lordofthesea]

it will take a while, buteventually it will mix.

 

[alchemist]

I am going to experiment with something similar - I am hoping to slope the gravel down to the sand across the tank like a beach effect. I am planning to put the sand into a plastic tray to keep the majority of it separated and then bank around the edges with more sand.

 

[star4]

Juwel do something called "rock terrace" it looks quite good, you could use that to keep the sand and gravel seperate.