As others have said, BTC is forking which is likely pushing alts down (and BTC up). I'd like to spend some more USD to go into altcoins, but the only way I've bought coins so far was buying BTC via coinbase and then using that to buy altcoins. But since BTC is spiking right now, should I just buy ETH and convert that to altcoins?
ETH seems pretty down at the moment and it is not bad if you use it to purchase your coins.
However, if you can monitor the movement of BTC and you can get at a good price, may be $5300, seems that is where the support is picking presently, you can still make good buy as you may be lucky to get the value increased the more in the process.
Although, if I am to choose presently, ETH, seems pretty good to me at the present value for you to buy other alts. Good luck.