What they don't say on those Youtube videos is that 6 months later they had to start over again from scratch because their plants and fauna cultures died. Youtubers don't like to admit failure. I suggest you search for "bioactive" threads on this site. You'll see many different ways of going about it. You will also see stories of keepers who had to try over and over again before they came up with a set up that worked for them. I emphasize "for them" because the set up that worked for those keepers may not work for you. My point is that setting up a bioactive isn't as easy as they make it look on Youtube. You will probably have to try over and over for months before you get it right.