AngelFish29

Thanks again! Here's a new pic of the rock currently.

Thanks people! Scrubbed them all after taking them to the sink. Hope they won't come back...

Hello fellow reefers! I have a rather pressing problem occuring in my aquarium. Recently, some dark purple substances had grown on the live rocks. It appears sticky, and is spreading across the rocks. Its seems to affect the leather coral nearby. Any idea what is this? Is it harmful? and also what can I do to reduce it?? I'm not so sure if its algae or not, but it seems to be (to me at least) >.< Picture attatched Thanks in advance