heels, that is nothing...
How long have you had your aquarium set up?
I've noticed our algea and LR go from the original brown to going to a darker brown coating, to purple and green in all variations of colour. I've been told and read that it is just your tank building up what it needs. Our water levels have always been bang on from the start (knock on wood). Your pictures look great. I belive some of the pics. on my profile will show you the rock and the variations of colour just not as close as yours way though.
My Sailfin does a GREAT job of keeping things at bay. We also have 4 large snails that live on the rocks that help eat everything to.
Just relax and enjoy the colour show!