I don`t know if this should be in the aquarists section but, does anyone keep mudskippers? I saw some for sale in a shop and thought I`d find out more about them. I believe they live in slightly brackish water but how do you guage how salty your tank water is supposed to be? Also, is there anything else you can keep with them (ie. fish suited to brackish water) or should they be kept only with their own kind?