translucent snails/worms?

[gadjahmonkoer]

what kind of hitchhiker is this? it can unite and separate itself, he also eats brown algae

 

[Crabs McJones]

Looks like flatworms, hard to tell what kind though, are you able to take a good closeup picture of one of them?

 

[gadjahmonkoer]

Looks like flatworms, hard to tell what kind though, are you able to take a good closeup picture of one of them?

sorry, these all my best photo(not as good as you expect), they're look eats brown algae