Can't quite make out stuff in the first pic, but the purple stuff (if not coraline algae) is a kind of plating algae. It's harmless as long as it doesn't explode in #s
The other 4 pics are not there
Edit: OK I see you are still uploading
Could you try using something such as Photobucket or Drop Box to post your pics ? You upload, then copy the link and paste them into the post
It would make it easier for us to view them