Although mad scientists have been trying to keep fresh and saltwater fish together for some time, and some even claiming success, this video is some of the first evidence that some scientists are that crazy (and that it is really possible). The video above was shot at Aquarama 2009 so the fish are in a temporary situation anyway but we assume that the developers of this new product from GEX have already experienced longer term success. So how does this system work and what is it exactly? Well disclosures about the true nature of the system are sparse but we believe it is a combination of two factors: Some kind of particle or nanobubble in the water which behaves similarly to salt for one of the types of fish but not the other and a form of salinity compromise which is clearly visible in the fish in the video. You’ll notice that all the saltwater fish are aggregated near the bottom and the freshwater fish are all near the top. This type of vertical stratification is exactly what we would expect to see if you placed freshies in saltwater and salties in freshwater. So does this video tickle your curiosity bone or is this just a gimmicky technique which has no place in a real aquarist’s tank? Take the poll and share your thoughts in the comments.