I use 8MLS of bayers in 1L of tank water. Dip for 5-10 mins and rinse in clean tank water. I have had nothing get through at these doses.
Not saying you should or shouldn't use bayers in this case. But I myself would look at bacterial or virus infections and do a selco (concentrated) iodine dip first. As bayers is more for pests then bacterial or virus infections. I myself like to take the least stressful option first and then move on if needed.