Forester
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Planaria are ubiquitous in aquarium. Fry will pick on and eat planaria. I often remove bristlenose from my fry tank to allow planaria multiply so as to furnish live food for the fry. Bristlenose eggs are huge in comparison to planaria so it's hard to believe planaria will devour the eggs. Do you blame on the wrong suspect or you have the unusual type of vicious planaria.
They are definitely planaria based on what they look like. I think the reason they were able to eat the eggs was because there were hundreds of the planaria.
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