Cleaner shrimp are hermaphrodites (each individual are functionally both male & female). Usually after a molt, shrimp A will lay eggs which shrimp B will fertilize. Then shrimp B will lay some eggs & shrimp A will now fertilize those eggs. Therefore, with one pair, you will often have 2 shrimp carrying fertilized eggs. The babies are very hard to keep alive IME. I've tried at least 8 times but the longest I could keep them alive was 4 weeks. If you have several small tanks with bbs in them, you might have more like than I did.
Good luck,
Anthony
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