I know, you guys are probably thinking oh God, here she goes again. Sowwy! So, I recently posted about having a break out of brown algae. Well last weekend I took a toothbrush to my entire tank/rock and I did NOT notice this little guy. Well one week later I have not one but two of these weird, hard lil things. I thought at first it may be a form of glass anemone, so I touched it and it's hard. It is thin and whiteish. I took it to my usual shop today and the gentlemen that works there said that he has never seen one in 25 years of keeping saltwater tanks. I've posted pics from my camera phone so I'm sorry if they're blurry but I have no clue what they are and if they're harmful. They either were in the rock that it's attached to and I disturbed them or maybe hitchhiked off of some rock I've been keeping separate in my ER tank to cycle it. It was shipped from Puerto Rico but those two tiny pieces I dropped into my tank had been in there a good week or more before I noticed these little guys. This growth (there was two, one attached to my tank and I took it to the shop for identification) is a tad bigger than a quarter in size in ONE WEEK! HELP! Is it good? Bad?
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