I currently have a 75 gal sw fo tank it has been doing great the past few years so I have now decided to get rid of my fw fish in my 125gal tank so I can convert it over to a sw tank. I want to get two sharks but I have done lots of research and now I want some input on what kinds of other fish you can have with them, what actually works on food to feed the sharks, is sand best, and anyother helpful info you can give me.