A Green Dot Next to the Star Polyps

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“What is that green dot?”

When I look around the tank, I see plenty of algae, floating bits, and things I can’t quite identify. Most of the time, the trochus snails or peppermint shrimp clean them up pretty quickly.

This time, there was a green dot on one side of a clam shell, so I just thought it might be a slightly brighter bit of algae.

Star polyps and a torch coral are visible, with a clam shell to the right of the star polyps and a small green dot inside it.

But when I looked more closely, one tiny strand of star polyps was moving!

I had left the star polyps on top of the clam shell for about a month, and one strand had spread across the shell.

Very small torch coral and star polyp coral frags from the early tank setup.

When I first set up the tank, I started it with one very small torch coral and one star polyp coral.

Star polyps, the coral that had been there from the very beginning of the tank, even before I added any fish.

Seeing it cover the frag and stretch beyond the frag plug is honestly pretty fascinating.

Maybe the clam shell is too light, but when I check the tank after waking up or after getting home from work, the shell is often sitting on the sand bed.

I think the trochus snails probably push it around while wandering for food.

A while ago, a crab used to hide inside the live rock and come out at night to shove all the corals around. Could this be happening again?