Judicial conduct is governed by a Code of Judicial Conduct and the rules are called canons. Here are the Florida Judicial Canons.
http://www.floridasupremecourt.org/decisions/ethics/index.shtml
It is not unethical to talk to people, to have friends, to express social courtesies even by calling someone. Judge Strickland is not going to be the trier of fact in this case -- that will be the jury. Judge Strickland's key role as presiding judge is to maintain order in his court and proceed with the trial of this matter. He doesn't have to be neutral as long as his decisions have considered everything he is supposed to consider.
Think about it. What happens in a bench trial (tried before a Judge alone) and there is inadmissible evidence presented but not admitted into evidence. We expect that Judge to ignore that evidence when making the decision. Judges can real newspapers, watch television and generally be part of the community.
The old mantra of "appearance of impropriety" is often misused for a yardstick for the speaker's concerns rather than a standard of judicial conduct. What might be improper in the eyes of a super sensitive observer is not improper for the majority of us. Part of the standards involve what do other Judges do.
Just because the defense writes and files a motion doesn't mean it has any merit at all. Makes them look busy.