I'm buying a few plants from an online store and I have heard that with certain plants like hornwort, bleach solutions can kill them. I have heard of potassium permanganate being used instead. My question is, how long should I soak them in the solution for? I have heard answers from 10 minutes...

OK so you pretty much read everywhere to rinse the things off in "used" tank water. At first I just said ok...cause what do I know. But now I'm wondering why exactly...I mean all the Beneficial Bacteria is "sticky" and water changes to not really impact it because the BBs are not in the...