carlinhos,
Looks like a great rock work smooth and clean :thumbsup:
I think its a great idea preparing the "legs" for the rock to make it stand solid at minimum floor covering - looks super :thumbsup:
One question though - why did you cover the top of the rock-work with cement also ? for aesthetic reasons ?
looks like this way will have less ground for the bacteria to grow and populate on, no ?
You're tank is one of the best tank over the globe, keep on the awesome work :dance: