Actually according to my research, all the alts mainly go red if the price for bitcoins is increased. Some alts have negative impact and they do grow along with bitcoins. Proer study is necessary to buy at dips and sell once high. I think, it is a good time to invest into altcoins like mainly DOGE. Doge too can go up. It is good to make some research before investing into. Hope you can find any good coin to invest into as all are red now. They will surely rise some or the other day so keep on holding your coins after the purchase.
Bitcoin is the benchmark for all the alternative coins and yes they all show different behavior. I highly support the idea of investing into alternative coins because I think it is good to have diversification in your investment. But I would rather go with Ethereum, ripple and Monero, may be Litecoin also.
Doge is also making its place in the list of trustworthy alternative coins but I am only curious about the performance of Ethereum this year.