i am having trouble

[hammer head]

i am having trouble deciding what kind of puffer i have,all of the red eye puffers i seen does not look like the one i have ,mine is light green with red eyes ,a red spot on both rear sides and seems to be bigger than other red eyes.mabey it is not a red eye puffer ,but that is what it was sold as .if you think you know what it is can someone tell me what and how big they get ,the pet store told me it would get around 8 inches