check these threads out, they help with the zero cost growing.
https://www.icmag.com/ic/showthread.php?t=94673
https://www.icmag.com/ic/showthread.php?t=177463
https://www.icmag.com/ic/showthread.php?t=73866
https://www.icmag.com/ic/showthread.php?t=96325
https://www.icmag.com/ic/showthread.php?t=94673
https://www.icmag.com/ic/showthread.php?t=177463
https://www.icmag.com/ic/showthread.php?t=73866
https://www.icmag.com/ic/showthread.php?t=96325