I'm going to be setting up a 120g in a couple of weeks and am wondering what's gonna be the best method to cycle it? I have a 55g and was thinking of doing 30% water change and putting the old water in the new tank. I can also get a bunch of saltwater mollies at my LFS for cheap. Then there's the bottled bacteria. I'm leaning towards using the old water and grabbing a few saltwater mollies. Looking for feedback and possibly how many mollies I should put in to effectively cycle a tank that size?