Hello. I am not sure what the insect is. Although, there are tons of bacteria, larvae and possible parasites in wild pond water. I would actually recommend you start over. Empty out the tank and then add a 10% bleach to water solution and let it sit at least 10 minutes, though I myself would let it sit all night. Rinse thoroughly. Then fill it up again will about 4x the amount of water dechlorinator in water and let it soak again to neutralize all chlorine and chloramines. Rinse again. Then begin setting up your new tank.
Pond plants must also be thoroughly rinsed, bleach dipped (10% bleach), extra dechlorinator dipped, and rinsed again. Same with any wood or rocks used.
This is the safest way.





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