Gary Majchrzak
Team RC
You can't see them. They're under the rock pile on the left. They protect the main drain standpipe.

<a href=showthread.php?s=&postid=6875275#post6875275 target=_blank>Originally posted</a> by Gary Majchrzak
And don't ask me what that black thing is 'cause I don't know!
<a href=showthread.php?s=&postid=6878259#post6878259 target=_blank>Originally posted</a> by Gary Majchrzak
Here's a related thread on how to improve shots of a whole reef aquarium with halides are on:
http://www.reefcentral.com/forums/showthread.php?s=&threadid=781247