Double bagging the fish by potting the top in first then closing the new bag gets rid of all corners.we use an automatic convayor belt sealer. Its actually a potato chip bag sealer. It fills Oxygen and seals all bags in a convayor belt setting.. We stole that idea from a very big name brand coral and fish grower. (wont say name as they didnt even want to share any info when I asked them)
So all bags are sealed by a machine. only bags we seal our self are clipped by a susage clipping machine which is also automatic. We twist the bags neck and place it in a machine that clips it automatically.
But point noted and will see what we can do to seal the edges some how.