There are a few things I've never understood about this game really.
One, cities inevitably get the green stink cloud and the green sick frown. Besides building an aqueduct, how can you fix this? How can it be avoided? I built an aqueduct and my people are still living in their rank, putrid bowel ejection and drinking each other's urine apparently.
Two, the angry red-faced people. "It's too crowded!" is the main complaint. Uhhh, kay? So you want your cities to grow, but then they get too crowded? They can be pacified with coliseums and stuff, but... I dunno. I still don't really get it.
I know you guys aren't the instruction manual, but I'd rather look for dung in a rhino's butthole than search through an on-line manual to find the answers.