Okay, I have a 'monster' and a smaller little harmless shrimp. The smaller one is berried!! But the 'monster' is about 2x the size (and still growing) but the smaller one is also growing I believe... I thought they were different, but once she had berried she has the other ones pattern.. Could the bigger one be the male of her species? You can't see it in these photo's but the black markings on there stomach/side area are also the same.. The smaller one looks more of a reddish in the dots etc as she has just molted, but that's also what happens when the bigger one molts..Can shrimp store sperm..? I don't want to be overrun! For more pictures and a video of the bigger one go to - http://www.aquariumadvice.com/forums/f44/long-armed-prawns-156117.html Thanks!