According to my observations alts go down when btc grows and alts go down when btc falls. Alts go up when btc price stabilizes. So I thing it is better to be prepared for any scenario, make everyday research of the market and if you have a trading system then strongly follow it. There are too many temptations, provocations and ambiguently read signals at the moment. Almost every day I am confused with self-contrudicrionary signals (price movement, volume behaviour etc.).
I hope that money would flow into altcoins and they flow into them at the moment, but many of altcoins even those supposed to be down now will go lower before strong upwards movement.