Good morning reefers. I recently acquired a 65 gallon cube setup from a friend that did not want his tank anymore. I plan on using it for coral QT and for a display. Kind of a little trial and error tank that I don't mind experimenting with. before I start putting anything in it, I wanted to know what these might be (the red little things on the rocks and one in the sand). There was at one time a lot of coral and fish in this tank. My friend kinda let it go over the years so now it looks like a graveyard. The only thing that has survived in this tank is a 10 year old maroon clown that is still doing awesome especially after the move. I changed the lights and have started to see some new things in and around the tank. Any thoughts would be appreciated.

