I kept them separate for about two weeks. I guess I should have done longer...but the new frogs seemed like they were doing really well and I thought it would be okay. I feel like the first frog was a fungal infection...I am almost positive of it because of the spots that were on it. Then I cleaned out the whole tank and etc etc. The other frog that I had housed with it for months seemed fine. I bought a new frog and kept it in a separate tank. It wouldn't eat any crickets and died 8 days later. I then bought another new frog, kept it separate for 15 days and it seemed completely fine. So then I had it move in with my other frog that I have had for several months. The other day the older frog ate a cricket and got eco dirt all over him and was having trouble getting it off. I think it affected his eye, and then I am not sure really what happened from there. His behavior got really off and bizarre. So...I guess my question is...do you think that I should try to feed my frog in a separate container...like take the frog out of the tank and put it in my critter keeper and feed it two crickets...this way I know it is eating and isn't getting any dirt in its system?