Maybe its a dragonfly nymph (Larvae)... ?

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211gal- 4 Clown loaches, 1 African butterfly fish,4 Dension barbs,2 Jewel cichlids,2 Firemouth's, Green Terror, sailfin pleco, L142, 2 cory's Candy striped pleco,4 Siamese algae eaters, 14 Black widow tetra's, Striped Anostomus, 3 Hoplosternum thoracatum, Fire Eel