Can anyone identify this critter, please?

eatyourpeas

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Caught it sliding down the aquarium wall towards the sand substrate, where it disappeared. I gave up on google image search as it keeps sending me into outer space (literally!) and can't find anything like it. It moves like a slug, just sliding. About 1.5 mm long.
1609878249140.png

Tank inhabitants are cherry shrimp, bladder snails and ramshorn snails, ostracods and copepods. Plants are all floating or epiphytes except for a baby crypto. Sand substrate, wood, no ferts. Light on for 8 hours a day.

Tank is 6 gal. fully cycled and heavily planted. Parameters are:
pH: 7.0
Ammonia: 0 ppm
Nitrites: 0 ppm
Nitrates: 0 ppm
Temp: 78F

1609878659033.png
 
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eatyourpeas

eatyourpeas

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It is not an egg sack. It is elongated and slid into the sand substrate like a nematode. I am still looking at creepy crawlies videos to see if I come across something similar.
 
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eatyourpeas

eatyourpeas

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Hopefully I gave it the fright of his life and he died or is in comatose state in the substrate. Have not seen it since, so maybe the human ogre face worked!
 

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