Grassy Top Rocks (Tepui in the aquarium)

[PotatoFish]

I found these cool-looking rocks at my local wholesale fish store, and I got this idea I thought would be pretty neat. I would let the rocks accumulate green algae on top, and when cleaning, I would only scrub the sides of the rocks. That way it would look like the Tepui Mountains in South America with grass on top. What do you all think? Does it achieve the look?

By the way, does anyone know what kind of rock this is? It kind of looks like petrified wood or sedimentary rock of some kind.

[Katherine]

That looks super cool!

[mtnmonster]

That does look cool. Depending on the size of rock, some bits of well trimmed moss would make it look like some trees were there too.