Take it from an old time saltwater hobbyist (have had marines since 1973. First tank had a slate bottom and metal frame around it. Does that age me? lol) the wet/dry filtering system is the greatest invention for the saltwater hobbyist since sliced bread.
The idea behind the undergravel was great at it's time but the drawbacks are too many. You need to be constantly cleaning underneath the plates. Too much work in my opinion. As mentioned before, lose the UG and definitely get the protein skimmer ASAP. With live rock, there is a higher risk of organism death on the rock during transportation and a skimmer will help reduce the toxicity of this. Think of this "curing" time as a "recycling" time. Keep an eye on your ammonia levels after introducing new rock.
Welcome back to the SW