I have become one.
After ages of not attending to this important issue, I got serious again. Got a nice sturdy kitchen scale, and a small wooden perch which the Rb is willing to step on, and...
We're weighing twice a week. 233 grams for the last few.
But then I started measuring EVERYTHING. His food, how much he eats, how much he drinks, how much *I* eat, how much perches weigh, how much my jewelry weighs... oh, and the average green chile weighs about 5 grams.
Any other weighing nerds?