You can use as many formula blocks as you need to achieve what you want.
By definition,
CandleMiddlePrice = (HIGH - LOW)/2
If you want to calculate that price level for any candle going backwards, you just need to type the candle´s ID number for which you want to know its MiddlePrice by following the ID rules given by fxDreema at the formula´s block Candle ID field.
CandleMiddlePrice [0] = (HIGH [0] - LOW [0])/2 -> MiddlePrice of the newest candle
CandleMiddlePrice [1] = (HIGH [1] - LOW [1])/2 -> MiddlePrice of the previous candle
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CandleMiddlePrice [n] = (HIGH [n] - LOW [n])/2 -> MiddlePrice of the n-est candle














