Are all bacteria created equal? For instance, when setting up new tanks, the easiest way to cycle the tank is to set it up with an established filter or used substrate. This is what I generally do and it is pretty reliable when done correctly. Most of my tanks are African, so I'm generally setting up new African tanks. Can you use bacteria from an African tank to seed a tank that will house New World fish? Is the bacteria the same, or are different bacteria present for different populations of fish? I don't want to cycle the tank but find out the bacteria won't process waste because its from the wrong tank. I only have AC110s on my current New World tank, but I'm setting up a 29 gallon tank for some smaller New World species. I won't be putting an AC110 on this tank so I can't just switch sponges like I'd normally do. Any thoughts or suggestions for the easiest way to cycle the smaller tank?