In the last trading session, U.S. stocks erased almost all its losses made early in the day as the tech rally tried to partially offset the slew of weak earnings reports. Among the top ETFs, investors saw SPY lost 0.2%, DIA was off 0% and QQQ move lower by 0.1% on the day.Two more specialized ETFs are worth noting as both saw trading volume that was far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most recent trading session. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra-interest continues:SCHO: Volume 8.65 times averageThis short-term Treasury ETF was under the microscope yesterday as nearly 3 million shares moved hands. This compares with an average trading day of roughly 385,000 shares and came as SCHO added about 0.4% in the trading session.The movement can largely be blamed on higher yields that led investors in search of better hedge to rising rates. SCHO is down 0.2% in a month’s time and has a Zacks ETF Rank #3 (Hold) with a Medium risk outlook.QDF: Volume 7.23 times averageThis quality dividend ETF was in the spotlight yesterday as about 664,000 shares moved hands compared with an average of 101,000 shares a day. We also saw some price movement as QDF shed 0.02% in the last session.The big move was largely the result of heightened volatility that can have a huge impact on the dividend stocks like what we find in this ETF portfolio. QDF has gained 2.5% in the past month.Want key ETF info delivered straight to your inbox?Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week. Get it free >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report SPDR-DJ IND AVG (DIA): ETF Research Reports NASDAQ-100 SHRS (QQQ): ETF Research Reports SPDR-SP 500 TR (SPY): ETF Research Reports SCHWAB-US ST TR (SCHO): ETF Research Reports FLEXS-QLTY DIV (QDF): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report