el_nino

i have noticed today that there are a few little brown worms that look like they make a algae cocoon to hide in. does anybody know what these are and if they are harmful please help

aquarist48

Is there any way you can get a picture for us? Personally, I don't have a clue what they could be, but I'm sure there will be someone on this site that does.

el_nino

they are so small, i do not have a good enough camera but i will try. i have been reading and i think they might be fish leeches

aquarist48

That's a good possibility. I read something along those lines on this site. Do a search close to the top of the page for leeches.