My first SC4 city was a slum as well, one half was industry, the other half was crime, and the third half was pollution, MY WATER WAS BLACK, three halfs, cause it was 150% dyfunctional, the only thing that was working was the budget, just barely, then like an idiot I downloaded a city, put it next 2 my slum, clicked reconcile edges, and BAM, I was suddenly 24 K in the red and had no bride, half my industry and most power had been destroyed, the clouds of brown air were the only sign of life, I accomplished this horror in 4 hours, then when I was an idiot and destroyed it I deleted it in a rage, my current city has a pop of 100K and 1.5billion dollars, thank to money parks.