What Are The Rocks That Amano Uses

[Tonyb111111]

Hi all, long time since I posted but I want to scape my tiny 20 litre tank and wanted to know what the silvery grey rocks are commonly used in Iwagumi set ups, and where to get them from. Help would be appreciated

 

[Ps3Steveo]

Have a look on the green machine website to identify them, I'd go with mini landscape rock from aqua essentials tho as its similar but cheaper.

 

[Tonyb111111]

Spot again mate, duly ordered, thanks