This is exactly what I've been saying all along, and I quote myself here...I would have to mostly agree as I can tell whats off when its off but you can not tell by how much without testing and as I said before if your plannjng to dose anything you have to test to find out how much needs to be added I'm not saying that you dont need to test I'm only saying you dont need to test as much as some ppl say you do and more often then not the tank will show you somthing is off long before the test will expecially if using cheap testing kits that are unreliable
You can honestly tell me that you can look at a coral and tell if it needs more alkalinity?
But you just wanted to argue with me.