Keep in mind, one will not do it. And in bigger tanks you might need a dozen or more... At $15-20/each. I bought two for my 70... Never listened to the breeders advice and never saw them again. And never solved my issue.
The breeder up here... He told me buy several. Breed them in a separate tank then add to problem tank. I can't remember his name right now, themastr or something like that. Maybe somebody remembers his name in here. I would recommend you ask questions of him, as he will give you better advice on these particular nudis than any shop will. He hobby breeds and sells bulk.
They are very small compared to other nudis.
I would say consider peppermint shrimp before these if you are not willing to buy a whole bunch.
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