Now-a-days, whales are very patient. They will first drive down the price, and wait for a period of time and drive down the price even more, when everyone starts to panic sell...they will buy up very quickly then drive down the price again. Unless you got a pre-pump signal from a whale, you probably won't react fast enough to make a profit. As we speak, Eth price is going down to $260 at Poloniex. Good Luck investing!