when does fxn start it will be nxt snapshots like ardor right?
Fxn was a temporary name, the name for it is now IGNIS.
It will be a one-time snapshot of NXT when the Ardor platform launches in Q3, 2017.
After the single snapshot at the block for the IGNIS sidechain there will probably be a massive nxt dump. There is no incentive to hold like there was for the Ardor snapshots. However there will be some holders who wrongly assume the IGNIS snapshot will be like the Ardor snapshots.