When you go gsp tank again, could you try to take accurate measurements of the length of those puffers again? I would like to report back to the puffer community about your findings. Generally, Tetraodon Sabahensis are around 6inches (usually) maximum. If you're saying they are 1ft long, then its a significant finding. Also, find out the water condition (ie Brackish or salt? tank size? ect).
Thanks for your help.