I'm an idiot.
I just noticed the spoon I use to measure my ferts is 1/8 tsp. I thought it was 1/4. So while I've been dosing my tank, I've been dosing half of what I should have been. Granted, we're talking the EI method, so I'm sure it isn't as detrimental as it could have been, I'm sure I wasn't doing myself any favors.
In my defense for taking this long to notice it, I scoop out all the ferts I need for the week and put them in a pill dispenser.
The definition of insanity is doing the same thing over and over again and expecting different results.
- Rita Mae Brown