I keep it simple when scanning, other then checking yahoo finance for big gainers, or finviz etc, I run these scans EVERY night. They are simple, probably exceedingly so, but they work for me.
show stocks where close gained more than 20 percent over the last one day and price is between 1 and 10 average day range is above 3 and volume is more than 100000
Red candle floaters:
stocks where close is above upper bollinger band(20) and close is below open and price is between 1 and 10 and volume is greater than 100000 offset is 0