No I am not adding beneficial bacteria, and frankly, I had no idea I was supposed to . . . I chose not to use any established media because I haven't had any fish recently, don't really trust PetSmart, and my friend who has 4 single tailed goldfish stuck in a 10 gallon
, so I didn't want to use her filter. Usually tropical fish don't need as much filtration because they don't have as much waste as goldfish, and because a strong filter would might hurt my female bettas' fins. But you could certainly have more if you have a filter baffle of some sort so they don't get sucked against the filter.