My tank is having a lot of green algae spreading is this a sign of my tank maturing and is it in the ugly stage and what can add to keep the sand clean and kinda get rid of some of the green algae.
This is desirable. You should be happy, not trying to fight it. Just get a CUC and they will clean your sand. When you start buying corals, coralline on the frags will multiply and the green on the rocks will transform to pink. You can’t keep white rock in a reef tank.