crazy, but nice to see that BTC is able to hold its ground
+1
It's pretty much rock solid in spite of some fairly large splashes from eth.
seems to be fresh fiat thats driving ETH, otherwise it could have been really ugly.
Are you sure it's fresh fiat that drives ETH? I think it's just the same traders selling and rebuying, shorting, getting margin called etc.
Total market cap of all crypto-currencies (BTW the only chart that really matters vs. FIAT)

you can clearly see, that since December bitcoin and altcoin markets are decoupled!
just for fun:
ETH is on its way to $30 > Bitcoin will fork ($400) > invested money in ETH will shift to Bitcoin ($800) > ETH will come back to $5
Edit: time frame is Q2 - after that we'll see a crypto bubble ETH $50 / BTC $3500