If you were not already Invested in Ethereum, you would have had at least not less than 50% of your investment in Bitcoin however since we are already here, Ethereum is also a good coin for investment when talking Altcoins, and don't bother about the current downtrend of the market, as long as you didn't sell you are good till the bull season. I understand it can be depressing at times seeing your investment going down it would have been the same with Bitcoin cos every coin is experiencing this right now.