What is this red things

[s14y3r]

I can't seem to find what creature this is. I'm afraid they are going to summon devil. originally they are scattered, but now they line in circle.

Can anyone help me identify them?

edit: okay search a bit in forum. found out may be formanifera. so are they bad?

 

[LisaAP]

Homotrema rubrum, which are indeed foraminifera. Nothing to worry about, actually pretty cool imo. If you look really, really closely you should be able see tiny strands poking out of the shell. They feed on particulate matter.

 

[sixty_reefer]

Sorry @LisaAP they could also be vermetid snail. Which are a plague under the right conditions and a risk of injury to fish and aquarist maybe the op could supply a better pic under white ligh as they kinda look like homotrema also.

 

[s14y3r]

Homotrema rubrum, which are indeed foraminifera. Nothing to worry about, actually pretty cool imo. If you look really, really closely you should be able see tiny strands poking out of the shell. They feed on particulate matter.

Okay, thanks. Mostly it doesn't even move. So I'm pretty sure your answer is correct. For 3 week i never ever realized it can move. Suddenly today they make the circle.

 

[s14y3r]

Sorry @LisaAP they could also be vermetid snail. Which are a plague under the right conditions and a risk of injury to fish and aquarist maybe the op could supply a better pic under white ligh as they kinda look like homotrema also.

Sorry i don't have better camera. That the best, but maybe i can take another angle later.

 

[Reefing102]

Homotrema rubrum, which are indeed foraminifera. Nothing to worry about, actually pretty cool imo. If you look really, really closely you should be able see tiny strands poking out of the shell. They feed on particulate matter.

I would have to agree. They don’t look like any Vermetids I’ve seen and these used to be common on wild rock/coral skeletons back in the day

 

[LisaAP]

Sorry @LisaAP they could also be vermetid snail. Which are a plague under the right conditions and a risk of injury to fish and aquarist maybe the op could supply a better pic under white ligh as they kinda look like homotrema also.

A better photo might help but they don't look like vermatids to me. Sadly I have many of those so I know what they look like.

Here is a photo of some Homotrema had in my old tank years ago for comparison.