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What on earth is this fly doing in here

Ahh cheers Darrel, i can't catch a break with this tank. Hope it's the only one. They do look awesome in that shot mind.
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Damsel Fly or Dragon Fly Nymph both are predators & will take small fish.
They ambush & do not need to devour the fish as they inject enzymes into their prey which turns the prey into a "Soup" which they then suck back for nourishment.
this way they can take a fish larger then theirselves.
Often there will be no movement from the Nymph as their mouth parts are able to flick out & extend at great speed to get hold.
 
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