Take some o the filter media from your other filter that you used on the other tank. Or get some from a friend who has a well established tank. Like the other poster stated, also a API test kit is gonna be needed. Where are your fish now? What size tank are they in? Can you run both filters on the old for a bit? Then when you move the fish over just move both filters over to the 75g. You'll need the master test kit to check parameters to make sure you don't go through a mini cycle. But don't freak of you do, it happens.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley