HI everyone. I have an establish 10 gallon and a 10 gallon that just started cycling. The new 10 gallon has .2 ammonia. I just put 2 small cartridges (about 2x3.5 inches) in the back of my established tank filter, right up against the main filter cartridge. How long will it take for enough bacteria to build up on the 2 minI cartridges and when can I move it to the tank still cycling? When will it be safe to add fish to the new 10g? Thanks!