Need Help Identifying this Surprise

[Homestarmy]

I was doing some manual GHA removal this morning. I pulled a rock and found this thing, and I have no idea what it is and whether it's a problem or not. Please help!

Thank you!

 

[AlyciaMarie]

Looks like this could possibly be your guy...

Pericelis tectivorum, the GIANT Predatory Flatworm | Reef Builders | The Reef and Saltwater Aquarium Blog

Pericelis tectivorum is the name that was bestowed to a rare species of large flatworm that is occasionally encountered in reef aquaria and can really shock reefers who don’t know what to make of it.

reefbuilders.com

 

[Dom]

I was doing some manual GHA removal this morning. I pulled a rock and found this thing, and I have no idea what it is and whether it's a problem or not. Please help!

Thank you!

Looks like a flatworm. I understand they can be destructive.

But its very cool.

I'd keep it in its own tank.

 

[Homestarmy]

That definitely looks to be him and, oddly enough, there were a ton of snail shells by where I found him.

As cool and creepy as he is, he's got to go.

Thanks for the help!