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I saw some small bn's about 1 inch. Would the bug my 1/2-3/4 inch krib fry. It cause some algae is growing and the fry don't seem interested in it. That are in a 20 gallon.
BN of any size are safe with fry, but the algae will actually help support other micro-critters that tiny fry will eat. A single BN would be enough to clean up the algae in a 20.