After a hard sink from 20,400 level with a fat red candlestick, BTCUSD retested it only to get rejected with another big fat red candlestick. Seems to me that it's going to restest the 18,000 support fairly soon, and we'll see how that goes shortly. Problematic if it fails to hold and BTCUSD keeps slipping down the downchannel that it's currently in, as shown in the 2 hour chart here.