How fast can ich spread? I purchased 6 ghost shrimp for my two betta tanks today. Out of the 6 I found only one infected ghost shrimp he had ich. I immediately took all the shrimp out when I realized this. The shrimp were in the tanks no longer than 5 hours. Do you think ich can spread that quickly to my bettas? Super lame! I'm rather attached to my boys hope nothing bad happens to them.