Looks like possibly a dragonfly or damselfly nymph? Someone else may know better, but the body shape looks like that to me. If it is, check for others and remove if you can. They're bad news if you have shrimp or very small fish.
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joy to the fishes in the deep blue sea
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55, 30, 30, 20, 10, and 10-gal. freshwater tropical tanks
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