Please help identify organism.

[Brian Therien]

Baby Sea urchin? It does in fact move. My guess is it had to have come off of the live rock I bought. Tank is still cycling. Just saw brown diatom algae on the sand bed for the first time today. Thank you in advance.
Size- without a doubt would fit on my fingernail

 

[Joeganja]

Your right

 

[Brian Therien]

Your right

Since I only have a 14 gallon biocube, should I consider selling it at some point so it doesn't get too big inside the tank? Thankyou very much

 

[Joeganja]

Since I only have a 14 gallon biocube, should I consider selling it at some point so it doesn't get too big inside the tank? Thankyou very much

It's a hit or miss either people like them cuz they help control algae or they don't because they knock everything over. Better just to get rid of it since you just started your tank.

 

[Brian Therien]

It's a hit or miss either people like them cuz they help control algae or they don't because they knock everything over. Better just to get rid of it since you just started your tank.

I'm not worried about it knocking anything over. My rock are all extreemely well placed and solid. Plus this thing can fit on my fingernail. It's extremely small.

 

[ScottMyers123]

I would just keep an eye on it and see how it acts in the tank.