so i have 2 "GSP", or at least thats what the pet store said they were. the one being a GSP i have not questioned, its the second one i have. he is about a half inch to 3/4 of an inch longer than my GSP, looks like he has a more slender body to him, and doesnt look as fat as the GSP not even after eating. he gets a little fatness to his belly but nothing like the GSP gets after eating, even before eating the GSP looks like he has a little belly on him but the other one doesnt seem to have that belly to him. they look almost exactly the same except the slenderness, and the GSP looks to have slightly smaller spots. i was looking online to see what looked pretty much exactly like them and i saw the green puffer is very similar and sometimes sold in pet stores as GSP's. lately who i think is a green puffer has been getting these little black marks right under each side of his mouth, making him look sick. he doesnt seem like he is thought because he still eats the same and still is pretty active. he spends a good amount of time at the top of the water but utilizes the entire tank. what do you guys think?