Yes I've been using this particular internal filter for a few year now. I was thinking about placing the sponge media in the 107? I might have to change my planned layout if I run both filters.The internal filter has been runing for a good while? If that's the case, as another poster said, try to run both filters for a month or so to help get the 107 up and running. What media in the internal can you transfer to the 107.
I'm curious what sort of substrate are you getting? Some information on your new plants and lighting would be great too.?
For substrate, I'm going to use a base layer of jbl aquabasis plus topped with jbl manado.
I'm planting with eleocharis parvula, Monte Carlo, echinodorus red senna, eleocharis vivipara, vallisneria nana, pogostemon halferi.
I'll be using 60cm NICREW planted LED aquarium light