You have the start of some beautiful corals!!! very nice frags. I noticed some cyno and green bubble algae.. that gave me the indication of a newer system... a full tank shot would be cool!!
The cyno and green bubble tend to be on one rock that didn;t come from the sump of my main system. All the other rock was sump rock anything that isn;t purple.
So yes it is a new setup new sand, but established water and rock though it was only in the sump and stayed pretty white.