So I'm no math wizard but my husband says I gave them 8 times the dose, but that would be based on if they drank 1/2 gallon each which they definitely didn't so I'm not too concerned. There are 7 of them and combined they drank maybe half a gallon...
Two tablespoon is way too much! Re read the instructions. I think the actual dose is close to 1.5 teaspoons per gallon.
That says to add the whole package (1 pound powder) to one gallon, then from that gallon use two tablespoons for the gallon you're going to give your birds.
-Kathy