Normally when btc goes up, alt coins fall down. When btc goes down , alt coins move up.. Since these days btc goes down, many alt coins moving up.. You can see that clearly when you check the charts. Some people get panic due to this falling of btc. But at my point of view, I think this is the best time to increase the amount of btc we have. Buy some good alt coins and hodl them. So you can exchange them to btc when btc is down and can increase amount of btc you have.. BTC will move up soon again..