I'm thinking of downsizing my tanks and just having one tank - a 55 gallon brackish and getting rid of my 25 gallon freshwater tank. But I really like my kribs (who are currently in the FW tank) and want to keep them. I've read a lot online saying they sometimes come from brackish regions. I currently have three figure 8 puffers, three female & two male red velvet swordtails in a heavily filtered 55 gallon brackish tank. It's considered "lightly" brackish if that helps...it's at about 1.008 salinity.