Same here with doctor Foster and Smith. I love the way they do busineese, you know exactly when you get you order and 15 days if anything go wrong. Been purchase differents stuff from them for over three years with no complain
What you need is to cycle your tank and not to worry about the DR become LR ( this only happen in time). And to do that you need to set your tank up with filter, heater, power head, rocks and use dead shrimp to begin your cycle process ( take around 4-6 weeks). Need to get a test kit to check...