On the poloniex we can choose the alternative coins are increasing in the price about +2-3% usually the up trend will continue to be more increasing, I choose that open buy and hold couple hours and I sell them to taking profit daily,
the weaknesses of this methods for me, I must stay in the computer it takes my time and it is not too nice to the traders who doesn't have much time, I must doing cut lost if the price changes trend to be decrease.