They were rummynose tetra being added to perfect water chemistry. I know those are sensitive. I think it was stress. I knew to remove the carcasses right away and since I am being all perfectionistic about this tank, did so, and put them in a bag for the store. I did not even buy them from petsmart/petco.
*sigh* sad. I feel kind of silly being sad, but I was really sad.
Last edited by dbw27; 05-22-2014 at 06:24 PM.