They were store bought. i didnt check the sg of the transported water but the sg of the qt was 1.025, tested with a refractometer. they were transported for 2 hours in the bags though. the heater was a brand new one but was a brand i havnt used before. its a fluval heater. the air stone i used wasnt the small one either it was like a air brick, a 1.5 inch diameter.
Many LFS keep their fish system at a low of about 1.017 or less to save on salt. If so, it is possible that two hours did not equalize SG appropriately. However I would not use this sized tank for 5 fish.