Not sure what this is

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H.Greenleaf tank

H.Greenleaf tank

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20260407_171017_34C23908-FFAE-4480-8876-FC35C6D2136B.png
Wife found this in the tank. I have no clue what it is. Any help with be grateful. New tank 2 months old at the end of diatom cycle.
 

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