It's normal for every coin that just launched to the market, I've seen yesterday bcash price was $283 and it rise up to $382
https://coinmarketcap.com/currencies/bitcoin-cash/ Bcash is just an altcoin and just like other coins, it will be used as trading object. It is a good time to watch over the price and wait for the best time to cash out, maybe bcash could recover to over $500 again.
During the first week, a lot of people will be dumping their BCH tokens, and therefore the prices may decline. But after that I expect the prices to stabilize at
BTC0.20 to
BTC0.25 levels. It is difficult to say whether BCH will have an effect on the BTC exchange rates. But the initial indications are that the BTC exchange rates are not affected.