Kordon Ich Attack is plant and invert safe AFAIK.
Plants don't like salt. If you aren't sure you can ask the manufacturer.
I emailed Tetra about their tablet Ich Guard tablets. Tetra says they are plant safe as well, but NOT Invert safe (snails, shrimp, etc..).
Heat will make the life cycle go faster, but heat alone shouldn't kill Ich AFAIK.
My fish seem to have fought the Ich off on their own, no deaths, no signs of illness at all. But I will be treating with Fenbendazole , it is a dog dewormer effective against Planaria and some are using it for Ich as well. I know it won't hurt my Shrimp or Snails or Plants. I've used it before. Plus i already have some.