I'm running two fluval 305, do one can at a time or one bag at a time? And how long before changing next one, a week or so? Water change is done, and Skimmer is up and running. Still have floaters!!! Man the guy who had the tank before was over feeding. He was feeding brine in the morning and flakes in the evening. I was good to feed one or the other every other day. Guess the particles are coming off of live rock, guess ibshouod have taken them out and cleaned them before I did water change. Another ROOKIE mistake, oh well it what it is