Found this thing in my tank today out of nowhere, don’t know when or where it came from anyone by chance know if it could be dangerous or is it safe?
it seems to have a foot, so I’m assuming it was a coral that hitched a ride with a frag and then tucked away till he got this big behind my rock or something. Tried to get good photos, I will try to add more if I can manage to get better ones

it seems to have a foot, so I’m assuming it was a coral that hitched a ride with a frag and then tucked away till he got this big behind my rock or something. Tried to get good photos, I will try to add more if I can manage to get better ones


