Be careful, crypto investment has very big risk. Many fund that converted to bitcoin now it is mean that investors who invest in it are looking for profit. To prevent huge financial loss of new investors I suggest to all of them to sell their btc if the price of it fall 20% from the highest point of this bull run. They still can get profit if they keep am eye on the price chart. For me it is not a problem because I buy bitcoin at cheap price 
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.This is a very risky advice. The peak point reached during the current bull rally is $8,320 per coin (according to coinmarketcap) yesterday. 20% reduction from that level gives you $6,656 per coin. The lowest point reached in Bitstamp today was $6,252. So in case someone follows your advice, they would be selling their coins at the stop-loss price ($6,656 per coin). And right now Bitstamp is showing an exchange rate of $7,319.85 per coin. So it is very clear... had someone followed your advice during the past 48 hours, then he could have lost money.