I think I will do a case study here, I am going for the more expensive option as I have 5 breeding ram pairs! I'll keep you posted.
It makes sense to use foam, as it can be moved around no silicon.
This and part 2 video is great:
Saves buying a canister, will be more heat efficient, harbor lots of good bacteria, quieter I can buy two 50x 50cm for $40 each with this I can make 3 dividers. One section will be purely used to keep filter medium.