Etheruem surged higher Thursday alongside Bitcoin as a prominent hedge fund tycoon declared he would invest in bitcoin futures.The ETH/USD exchange rate eyed an extended move to retest its local top near $226.With halving coming on May 12, the pair could rise further owing to its positive correlation with Bitcoin. But there are risks.Ethereum moved upward quietly as the past 24 hours saw Bitcoin stealing the limelight after attracting a $22 billion hedge fund to its market.The second-largest cryptocurrency topped near $217 in early trade Friday, rising circa 9 percent. The move uphill came under the influence of a price rally in the bitcoin market. The Ethereum’s top rival closed above $10,000 for the first time in two months as billionaire investor Paul Tudor Jones decided to buy bitcoin futures contracts as a hedge against inflation.“Just own the best performer and not get wed to an intellectual side that might leave you weeping in the performance dust because you thought you were smarter than the market,” he wrote in an investment letter. “If I am forced to forecast, my bet is it will be Bitcoin.”Top 10 Crypto performance in the past 24 hours | Source: MessariThe euphoria among the bitcoin bulls helped to spark a similar tone in the altcoin market. While Ethereum rose 2.24 percent on a 24-hour adjusted timeframe, its crypto rivals followed suit. At the same time, the top 10 altcoins fell within the range of 1.5 to 4.5 percent against Bitcoin. Meanwhile, Ethereum fell just 1.74 percent.Further Upside ExpectedEtheruem corrected modestly by 2.91 percent after topping at $217 on profit-taking. The downside move – again – followed a comparably bigger correction in the bitcoin market. It validated Ethereum’s extremely positive correlation with Bitcoin, hinting it would continue heading upward as long as the top coin does.ETHUSD could retest $226 ahead of halving | Source: TradingView.com, CoinbaseThat correlation puts Ethereum en route to its April high near $226. The ETH/USD exchange rate could tail bitcoin amidst its pre-halving FOMO to hit the said target – that appears like a decent long trade opportunity. Nevertheless, if bitcoin corrects any deeper, it could also lead ETH/USD down towards $195.Because unlike Ethereum, Bitcoin stands overbought, according to their Relative Strength Indicator’s readings. Bitcoin’s RSI stands above 70 while Ethereum’s is still near 65. Readings above 70 typically prompt the underlying asset to fall back, as also noted by a prominent trader.“BTC looks toppy and the sentiment is so euphoric to the point where people forget to take profits and adjust their targets from 10K to 11k out of greed,” said the analyst.