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Black fur thing attached on my java fern leaf(Harlequin Rasboras tank)

Subject: Black fur thing attached on my java fern leaf(Harlequin Rasboras tank)
by Augustine on 20/8/2020 14:37:28

Hi, I have a Harlequin rasbora chasing other rasboras that coming near to a leaf with something black with fur sticking on it. I don't think those are eggs and I wonder what is the black fur thing attached on my java fern?