little corrections are there
it should give alert only above level like whenever adx crosses above 20 then it should alert after candle complete not below level,
same with arrow also
if there is red candle and adx has crossed 20 upside then down arrow,
if there is green candle and adx has crossed upside then up arrow,
in all scenario adx should cross upside only,
below 20 no need any alert or arrow, candle color is enough