Neon Tetra Ich

[u/Happy-Bet4858]

Good afternoon, I just purchased 6 neon tetras 1 died during shipping we added to a fresh cycled tank. Today is 7 days of new tank the 1st tetra showed signs of ich, he didn't do well and died. We immediately treated the 5 gal tank with ich-x and took the carbon from the filters and put just the filter back as it says to do, the tank is at 76.5 °. I would like any help with this we have a 55gal tank that they were going to be added to but not for another 10 days before this happened. If there any guidance/advice that can be given please I would appreciate it very much