Here’s a quote from the abstract in Nature:
we comprehensively and transparently show that…ocean acidification levels have negligible effects on important behaviours of coral reef fishes…we additionally show that …[results] that have been reported in several previous studies are highly improbable. [bold added]
Extending back to 2010, many of these studies were highly publicized at the time they appeared. Physicist Peter Ridd points out they were all produced by Australia’s James Cook University. Ridd, remember, was fired by James Cook after raising concerns about research quality.