Get a bottle of hydrogen peroxide 3% at the drug store. In a bowl or dish large enough for all your plants. Mix 1 part H2O2 with 4 parts dechlorinated water(match temp close to tank's). Submerge all of the plants completely for 30 min. You can weight plants down into the water with a small dish on top. Take plants out, empty bowl & refill with clean dechlorinated tap water(temp matched again), put plants in it until ready to replant. Don't rinse plants under tap. Just put straight back into the clean water bowl. Hope this helps. So sorry for your misfortune. Good luck, OS.
Bonified member of "The Wet Arm Society".
One's life should be measured by the number of people who smile when they remember you.