A green Heiken Ashi histogram represents a buy signal. A red Heiken Ashi histogram represents a sell signal. The indicator works for scalping, day trading and swing trading purposes. When used as a stand-alone forex indicator, it's recommended to change the "HMA period to use" to values above 50. NinjaTrader 8 natively provides Heiken Ashi as a bar type for most common bar types (minute, tick, volume, second, day, week, month, year). This Heiken Ashi indicator is provided for the Range, Renko and any custom bar types that may be added. The indicator performs in the same manner as the NinjaTrader 7 version. 4-27-18 […] How to use Heiken Ashi ZoneTrade indicator. How does one use this HeikenAshi Zone trade? does gray mean too late to enter trade or is it an exit signal? FxIndicators ; Gray means there is no definite trend, thus no trading. If you get a gray bar while in the trade, expect the trend to stall.