Hello Finch keepers!
I am new to this forum and this hobby. It only took one glance and now i am in love with finches.
I have a question. I recently purchased 10 Gould finches two of which already died

I purchased them from 5 separate stores. The two that died where from one store. From the start the two that died showed signs of not being totally molted with feathers missing and not looking as arranged, bright, and clean in color as normal finches, and the birds always looked buffed up, lazy with mostly eating and sleeping. And when compared to my other finches, they were smaller in size. The one could barely even fly to the perch. I should have paid more attention before purchasing them, but I blame myself for this. Now for my other goulds, they all look healthy with the exception of one. In general they all have good coloration and their sizes are normal and they eat & drink normal. However, one of them (a male with purple chest and black head) is showing signs of laziness and i am afraid of loosing him also. He does move and eats/drinks a lot, however most of the time he is standing at that one perch or sleeping. Also his wings are always lowered and semi-buffed, none of my other finches are like that.
Can someone help identify that is wrong with them and suggest a remedy. I just starting feeding my finches a mixture of seeds, KATEE rainbow, and Egg Meal (powder). Also I just recently started dosing my water with a multivitamin (that includes Vit E).
Thanks