My friend gave me a mudskipper. I have been researching how to care for them since I didn't know anything about them. Well she has this poor fish all messed up. To start there is no sand in the tank, not even much rocks, so help me know what to do to get this poor guy on the right track to survival. I know that I need to get him more land and more sand to make a burrow and I need to check the water salinity. Other than that I don't know what to do. What kind of sand should I get and what kind of salt? Please give me anything to go on here guys!! Thanks