The other day my dad came home with 3 gallon cube tank w/ a betta and 2 small whisker shrimp. He asked me to set it up for him. I reminded him that the tank should have been cycled before buying a fish. So what I did is take a piece of extra sponge I keep in my tank (for this exact purpose) and dropped it in his tank and I gave him 2 Marimo moss balls that have been in my tank for 2+ months and haven't been cleaned so they should be loaded with good bacteria. I also added some fluval cycle bio enhancer. I think this will be enough to instant cycle it. I will be testing along the way as well. What say you?