You can never garentee a paticular fish will take care of a problem. Algae problems are a result of excess nutrients giving the algae a food source. Unfortunatly it seams to take no time to have an algae problem but takes for ever to get rid of it.
you can pull calurpa out by hand and then perform water changes and make sure you are not over feeding, over stocking, and your bulbs are not too old
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