I am by no means a plant expert! I have only used bleach & PP to disinfect plants. The active ingredient in Excel is used to disinfect medical equipment because of its ability to kill bacteria, viruses, etc. I have accidently killed snails with it in the past. I have only read about using it as a dip to disinfect plants- I dont recall the exact amounts but I believe it may be 2-3x the regular dose. Bleach or Pp is alot cheaper. I would ask in the planted tank section for clarification or send Aquachem a msg. He is very knowledgable about plants (and excel) and will be able to give you a more definitive answer. Good luck!