Can a nem carry ich?

[findingnemo1]

I want to move one of my lta's to my 90 but i had a fish in there that had ich. So i took the fish out put it in quarintine a 2nd time and left the tank fishless for 2 months. Put the clown back in and low and behold there is ich again on the clown after he had been fine in quarintine for 6 weeks. So obviously something weird is going on here.
I will retreat the clown but I want that nem out of that tank but am worried about putting it in the 90 with my healthy fish.

Opinions?

Thanks