I have a decoration and some plants that were in a tank with a Betta that had cotton mouth (at least, I believe it was cotton mouth). I'd like to use them again for a different, healthy betta, but I'm nervous the plants and decoration are still contagious. How can I make sure they won't carry any harmful diseases? Is just washing them off really good okay, or could I just leave them out for awhile and the disease will eventually die? Also, I don't want to use my fish net again until I'm sure it's not carrying any diseases. What should I do with them?