There are times the price of some Altcoins fall yet it does not mean they are good buy. You need to study the Altcoin first. Study the white-paper study about the team and look critically well into the community. Personally I think nothing has caused Altcoin to go down and so I think with the current Altcoin turbulence due to the decreased Bitcoin movement from a few months ago so from now on many people are afraid of the current Altcoin decline.