What are these small snake like worms? are they harmful?

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zerojquan85

Fire Eel
MFK Member
Oct 16, 2008
2,325
6
68
So-California, US
Hi..

So recently i restarted a 60gallon tank that i have.. and i also used an old Canister that i haven't used for 10+ years.. I dunno if theres anything wrong with the media or bio balls..

But i am seeing two types of weird worm things.. one is small white worms that are sticking onto the glass like larva..

The other type is worms that are like snakes and swimming around the tank.. I did some research and some say that it isn't harmful.. and they are not parasite.. but rather annelid worms? or bristle worm?

I really dunno.. and my fish are fine.. also.. there is algae growing in this tank. because its getting sunlight during the day..

So what are they and how can i get rid of them?:confused:

Will adding plecos cure this problem? I have another tank next to it with 3 plecos and have yet to find any of those worms in the tank.
 
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