why altcoins prices rapidly going down now
it is because of bitcoin price increases so it makes altcoin price going down. but after bitcoin price down then the time for altcoin will come and we can see the price will increase again. don't too worried about altcoin price now because it will rise back so we can sell at the high price. but I am sure that another altcoin trying to increase although bitcoin price increases too.
I also think that, but also internal factors affect - like the bad product, unfulfilled promises of the team, lack of support...So now my favorite is IQeon because of full news feed and 24-h support