I personally like it because I dont have to fill the filter baskets to the brim and this means improved flow. Stuff like Sera Siporax is reputedly better in terms of bio capacity/volume but it is generally considered that most externals have more capacity for bio filtration than would ever be necessary.
I would say something like Ehfi mech pro and a layer of sponge for the mechanical, then whatever bio media you choose. As far as media for the new filter goes, the world is your Oyster. The lower your bioload the quicker you can do this. I would run them both for a month, then take increasing amounts of the media out of the Juwel over the next month. I can understand why you said that but I can appreciate why he wants to run them both. Not necessarily that practical since a Juwel internal filter works mainly with square sponges which dont really relate well to using in the new filter.
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