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Does anyone know how quickly or slowly Riffle shrimp actually grow? I think it was around 2 years ago (maybe 3) that I went to Cairns and got to collect some riffle shrimp. Since then I have purchased riffle shrimp and all have been large full grown females. But my dilmeia is I still am finding small riffles in the tank. Surely they cant still be the original small riffles wild caught in Cairns, that for some reason just arent growing. The only other option I can come up with is that by some miracle the riffles are breeding in the tank. Highly unlikely I know but stranger things have happened in peoples tanks. The tank is a 4ft around 200L with lots of structure and plants, filtered by a 800L/hr HOB. I rarely actually do any plant maintence on the tank and everything is pretty much let go, hence the constant suprise of new baby corys emerging. It was only because I removed the current falling apart java fern tree and remade it with new timber that I rediscovered that I still have plenty of small approx 1-2cm riffle shrimp hiding out in the tank. Other tank inhabitants include Threadfin rainbows, Pygmy rainbows, otocinclus, Borneo Suckers and chameleon shrimp. I was also pleasantly suprised by how many chameleons where in the tank and showing lots of various patterns and colours. So do I have particularly slow growing riffle shrimp? Are they gradually breeding? Or is there some other alternative I cant think of happening.