First, good to hear that things didnt go too far south on you in that little set back. Thats a real relief from where I am sitting!
Another suggestion, unless the tank is large, if you have a store that caters to reptiles, there is a pint sized dripper that works very well for just 5 bucks. I am kind of a tight wad when it comes to fun dollars too, so I made my own dripper with a 2 litter soda bottle, some air hose tubing and a air line valve. That works really good for me on my 135 gallon tank. Another thing I do is drip the kalk at night to minimize PH swings, as well since at night ones PH has a tendency to drop some. To my way of thinking, and I could be wrong, this helps keep things a little more stable water parameter wise.
As far as making a mistake...I think at one time or another we have all made a few - its an easy thing to do at times. I know I have sure made a few, some I would be too embarassed to mention. I just figure I have to chalk those mistakes up and let it be lessons learned....Thats the best thing about forums, you get to read about other peoples mistakes and can learn from thier mistakes hopefully before you make them, that way you dont have to "feel the pain" too, in the process.