Hey Fran. I am too late on the scene here. Happy New Year
I watched bits and pieces of the video so I may have missed the point but from what I remember you've got two externals running? The FX5 and another one? That seems perfectly fine to me.
Generally, very little media is needed to cycle a tank(I wouldn't worry what type of media) but the bacteria load on it is limited to the oxygen supplied. External filters probably get the least amount of oxygen compared to other filters, at least theoretically, and especially if they're used without pre-filters and not cleaned often. They do the job, despite that and the bigger the filter/more filters is always the better.
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