50% Retracement Indicator

On MT4.

1. I'm looking for an indicator that will show 50% retracement on 30 minute candle sticks. 
2. The 50% level appears on the candle stick immediately at the close of the 30 minute period.
3. The 50% level is marked on the candle stick by a short line.
4. The short line is 1px wide.
5. The short 1px wide line that is the 50% level mark is the length of the width of the candlestick.
6. The short line has a colour option.
7. There is an option to show or hide the 50% lines on the candle sticks collectively.

The functioning of the indicator must not interfere with the built-in MT4 Fibonacci Retracement tool.

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I own all rights to the indicator.