Marine Ich is best tackled by multiple forces that a reefer controls.
Think about a Chess Board and all the dynamics of the pieces. You have to protect the King from all attacks. So let us play chess:
King = Fish
Queen = Copper Safe Med
Bishop = Hypersalinty
Horse = UV sterilizer
Rook = Ozone unit
Pond = Garlic exlixir
Chess master = Smart Reefer
Protecting the King is what we all want, now stop for a moment and think of starting a game without a Queen or Bishop but having the other players, you may stay alive for a while, you might even win, but would'nt your chances be better with a full deck of players?
MG