New Creature On My Fish Tank

alecharis

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hi, I have a quiet large fish tank, I think there is a very good balace all fishis they are happy, but today I found inside the tank some new creature. I bouth some live food 6 weeks ago and this look similar but I am not sure, and I dout some of them survive. Does anybody know what they are. Thanks for your help

p.s. I remouve from the tank just in case....
 

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A larvae of some sort possibly mosquito, how big is it?
 
looks like a Damsel fly nymph, or mayfly nymph.
 
I think that's the one. I bought some live plants 4 weeks ago and they might be already there. Can they harm fishes in my tank or I can leave them there as a live food suply? (sword tail, ballon molly, loch, neon and tetra). Thank you very much.
 

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