disinfect

I don't have a quarantine tank set up and I'm going to be ordering some plants soon. I read a scary post about someone getting plants filled with planaria so am thinking about ways to disinfect the plants before I put them in my tank (which already has livestock). I know about potassium...

How do you know a tank is safe to reuse after losing all your fish? I have a tank that used to hold neon tetras. Not too long after purchase they all succumbed to what I think was false neon tetra disease but I never got a definitive diagnosis. Despite treating with antibiotics they still died...

Background: So I have two ten gallon tanks set up for breeding. Several months ago I did a water change and ran some parameter tests on both of them and within hours afterwards the half dozen Celestial Pearl Danios that I'd had growing out in one of them were dead... the few that I found in...