Yesterday I purchased a 3 gallon whisper filter. I put it in my established 30 gallon tank so it can cycle. I need that filter to cycle so I can put it in my 2.5 gallon tank which has 2 cardinal tetras in it. The filter has been running since last night...at this point how much longer will the 3 gal filter need to be running in the 30 gal to become established and ready to put in my 2.5 tank?