So i have flouride seachem in my tank now and im starting to get tired of the coloring. So i wanted to change to some sort of sand. My tank has been running for about a year now and is going well. I have 6 fish in my tank, its a 10 gallon tank with a aquaclear hob. Since its fully established i dont want to severely hurt my beneficial bacteria. So what would you do in this situation? What steps/precautions should i take before changing my substrate. Should I move the fish during the change or just keep them in the tank? If it matters i have a hagen mini, i've heard of people taking the media out of the hagen and putting in like a pantyhose full of the old substrate in it, would you recommend this?