What can be making these?

[dexterie]

Hello guys,

I’ve been having hard issues with algae. It’s somehow, getting better. However, I’ve noticed these long lines of “poo”? They’re about everywhere on the rocks.
Any idea what these are?

 

[garethwood]

Im no expert and your pics are hard to see but... could these be worm tubes?

 

[kirstyflash]

Im no expert and your pics are hard to see but... could these be worm tubes?

That’s what I was thinking

 

[dexterie]

They’re soft... like made of sand/dust/debris... They dissolve if I try to touch them.

 

[KJ]

Spionid worm.

 

[kirstyflash]

They’re soft... like made of sand/dust/debris... They dissolve if I try to touch them.

‘Spionid worms live within a non-calcerous burrow, typically lined by sand particles above the sand bedsurface. A beneficial worm to have in a reef aquarium, with their presence indicating a healthy reef aquarium.‘

 

[kirstyflash]

Spionid worm.

It took me half an hour to search the name of it! It was in the tip of my tongue

 

[dexterie]

Thank you so much for your help.
glad it’s not some alien bug