Heat doesn't help for marine ich (really wish people would start calling it by its real name, cryptocrayon, not "ich", but our hobby is not known for accurate naming....)
In any case, I think we have quite a few threads on here regarding the debate between eradication of crypto vs. keeping fish relatively healthy. Different philosophies that result in different treatment methods. Regarding proven treatment methods, there are more chemicals other than copper that work, and these have been scientifically studied and proven to work.
The real intent of my post would be get this thread back on track - if more people post tips & guides, that would be great! I will be happy to chime in with an "eradication" technique eventually, so that we have both philosophies up
Just... Maybe not while at work, lol.