Hadn't had my coffee this am when I was listening to 'red fraggle' - worked a long day yesterday too, but I'm with you David- I don't think she has got enough fish for any great growth on that many seedlings. In addition, since they are combining the sump and bio-filter, it doesn't seem like they have enough biological filtration in that little bag (looks like less than 1 cubic ft of bioballs) to substantiate coversion of nutients for the growth they are trying to acheive, but then again- she doesn't have many fish... Good thing she is not growing anything that requires a huge amunt of calcium or potassium beacause she didn't mention adding any of these elements- only iron.