Wrong.
To be clear, a judge should avoid not only real conflicts but also any appearances of impropriety. Accepting money from a lawyer who has a pending matter before him has sufficient indicia of impropriety to constitute grounds for a censure from a higher body. Two wrongs do not make it right. In other words, if both Schiavo's attorneys and the Schindlers' attorneys gave Greer money, and he accepted it, it's two counts against Greer and not just one.
Given how Greer is the only judge to make findings in this case, I'd say he's fair game for further investigation.