Hi, I've had a 20 gal cycled tank for a year and I need to upgrade to a larger tank because my male angel has grown so big. About a week ago I threw a bag of biomedia in the bottom of the 20 to start the beneficial bacteria for the new tank. I also plan to do my weekly water change tomorrow and use some of that water (from rinsing the sponge etc) in the new tank. last year was rough when I started the 20 learning about the nitrogen cycle so I don't want to put my fish thru that again. How long does the biomedia need to be in my existing tank so that it can give a good kick start on the new one? I don't have that many fish, one large angel and one small one, 2 tetras, a flying fox and an african dwarf frog. The 20 is planted and parameters are all perfect. I am hoping to get some guidance so that the move is easy on my fish. Thank you!!