after doing a water change in my fish tank,i found what look like little clear worms.what are they ?

Answer 1

These sound like common detritus worms. They are very common composting worms that feed on decaying matter in your aquarium. Many aquarists do not even know these are present until they stir up the gravel during a water change.

These are only a problem when they over populate due to too much organic waste buildup. Then they can often be found wiggling in the water column and compete with fish for available oxygen.
This article has more about these worms as well as pictures (near bottom of article):
http://aquarium-answers.blogspot.com/2007/03/trematodes-and-nematodes-in-fish.html

EDIT:
Based on how you discovered these worms, this is very common method of discovery of Detritus or other similar worms such as white worms, rarely are larvae found this way.

Answer 2

Don't worry,what you have found are dead blood worms,blood worms feed on waste matter and uneaten food,normally found under your gravel bed where your filter bed is,where they get both food and oxygen,fish go mad to feed on them.
When cleaning your tank you should use hot salty water,and you should boil your gravel to remove any unwanted bodies of any sort.

Answer 3

they are a type of water mite, i get the same things in my terrapin tank, i have yet to find a type of commercial treatment that will kill them, i found that mine came from the bog wood that i had in the tank. do you have bog wood in yours? if so it might be worth taking it out and trying without it. maybe a gravel clean n partial change would work every so often to keep them at bay? wasn't too bad with me i can do full cleans on my terrapin tank, you cant do that with your fish

Answer 4

Are these swimming in the water in a gentle "S" shape curve? If so what you are seeing if the larvae of midge, a small flying insect like a gnat. They are completely harmless to your fish and in fact many smaller fish will eat them as a source of live food. You can either remove them with a fine net or simply wait them out and they will eventually hatch.

MM

Answer 5

They could be fry, clear worms, amphipods, planara or other different types of worms.

Answer 6

I think your find they are little clear worms, which are ocasionally found in your fish tank.




My teacher was right, the answer is in the question!

Answer 7

fish poo

Answer 8

babies...keep them seperate