I know you guys are busy, but I have no one else to turn to. I have a tire track eel(Mastacembelus),agreen spotted puffer(Tetraodon Nigroviridis), and a moray eel(Gymnothorax Tile) that can handle almost any salinity. I just need to know the level that I should keep for them. And if I should use rock salt or sea salts.Please help if you can.