There is no reef safe treatment for ich.
Here are possibilities that might happen:
1) Do nothing, or treat with something claiming to be reef safe: Fish immune system might fight it off with good diet and environment and water quality. But it will always be there, pestering your fish... possibly one day getting out of hand and killing them.
2) Do nothing, or treat with something claiming to be reef safe: Ich will overcome their immune systems and wipe out your fish.
3) Remove all fish, let tank sit without any fish for 90 days. Treat Fish with any non-reef safe treatment in a hospital tank. Tank Transfer(some have reported failures-possibility from cross contamination), Chloroquine Phosphate (My personal choice-can't be used with pipe fish, sea horses, some wrasse), Copper/cupermine (tough on fish, not recommended) Hyposalinity (works well and is not harmful to the fish as long as you are diligent about keeping the water topped off and follow the instructions on how to do it, lowering it gradually, then raising it back up even more gradually). Always treat new fish for ich before being added to the tank. -No more ich in tank.