I am setting up a 125 soon and I'm going to be using my Magnum 350 along with a Flistar XP3 or XP4, I was going to get a Eheim Pro 3E but relized I need to pay other stuff so going cheaper. Plus I've heard good things about Filstar. My Mag 350 is already cycled so if were to put it on my 125 would the tank be cycled or at least partially even though the Filstar is not. Also I'm taking the Mag 350 off of my 40 gallon which already has a Aquaclear 50 on it and would it be the same scenario as the 125 if i added a AC 70 or 110. I doubled up the biomax in the AC50 thats on it now by taking out the carbon will that make a difference?