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Do any of you notice that your Neo's swim in circles around their tank? The colony of Neo's I bought have tripled their numbers in the past few weeks, from about 60 to 200+, with lots of new babies. Their tank is a 20 gallon long that is about 70*30*30cm. The water current in the tank is a very gentle flow from the top at one end to the bottom at the opposite end. Whenever I sit and watch them, about half are always swimming clockwise around the tank keeping next to the sides. They are semi-evenly spaced from top to bottom, with a few more at medium depth than at the top and bottom. They are also evenly spaced out in the parade, with equal numbers going left to right at the rear of the tank as there are going right to left at the front of the tank. Occasionally a single shrimp will swim a short distance in the opposite direction to the parade, but these are normally just swimming a short distance from one plant to another to graze. The half that are not on parade will be either grazing on plants, eating at the large mussel shell where I drop their pellets, or hiding away in some hiding place. The size participants in the parade also seem normally distributed from the largest to tiny babies. As the parade adds and loses members over time, they remind me of line changes during an ice hockey match. Some leave parade to eat or rest, while others join in swimming along. The larger shrimp swim faster than the babies, but they otherwise keep a fairly orderly circle going about the same speed. It's not a breeding behavior, as the the parade consists of males and females with eggs at varying degrees of development. If anyone has noticed their shrimp swimming like this, I would love to hear about it. Especially since many of you are in the southern hemisphere, I wondered if they swim the other direction perhaps. I live in the US. I've watched and my shrimp always go clockwise whether the weather is a clear day with high atmospheric pressure or raining with low pressure.