Ok. As you well know, my 55 gallon has cycled and levels are looking good except for low pH. When the time comes for me to change my filter media, I am so parranoid it is going to start my cycle over again. See, right now I have a Magnum 350 with a carbon container full of gravel from an established tank with a sponge wrapped around it. I just had that from when I was trying to get the tank cycled quicker. I threw some gravel from an established tank in the carbon container and put it in the filter with a sponge wrapped around it. Now, I want to take it out and put the other filter in there. If you have seen the magnum 350's they have the filter that looks like a giant bio wheel. I am afraid that when I change them, my levels are gonna get screwy again. Will someone comfort me and tell me everything is going to be alright??? :'(
