I got a used 30 gallon from my neighbor this morning, and rinsed it out and then set it up ( I had cycled media already and after a tank exploded yesterday I needed a heated place for my betta). Was I stupid for not sterilizing it with bleach? My neighbor said the fish that were in it are healthy (she's been in the hobby for like 20 or so years). During a conversation with a friend he asked if I sterilized and I said no, and he said that was a bad idea. Is it worth it to tear it all down and sterilize it, or will it be ok?