<a href=showthread.php?s=&postid=12669845#post12669845 target=_blank>Originally posted</a> by sivert55 what kind of substrate is that in the main tank? It has a black look in one of the photos.
is a mix of crushed coral and very fine sand, but is all covered with coraline algea so is got a dark purple color in some areas thats why it looks dark
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