Orange things on my glass

[Willba200]

Hi I have a 15l nano tank. Today I see loads of these orange things on my glass.

 

[dingusplease]

Flatworms. They are harmless, but can be bad if you get an infestation so big it inhibits coral growth... No need really to remove them unless you get too many. In that case, you can make a DIY trap (just search saltwater flatworm DIY trap)

Hope this helps!