I did have a look at these, and they are pretty neat. A little expensive for a pump, but its cool what you can do with them. I think when I get a bigger tank I'll go all out. These nanos are all about learning. I know most people say to stay away from nanos, because levels can fluctuate so much. Also there hard to keep stable. Well I dont think there hard. I think you have to monitor them closely, and keep up with them. They are definitely a lot more work then freshwater.