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Cool,after more looking,its definitely a guinea fowl/blue puffer ..they will get massive ..i hope you have a 250 + tank
Hope you know what you got ,,its a very cool puffer ,i'm a little jealous
It will later turn into a beautiful gold puffer( under perfect conditions ) ,,,awesome pick up ,your GF did good
If this fish came from the Pacific,( most likely the Sea of Cortez through Panama or Costa Rica) it's a Guinea Fowl Puffer (Arothron meleagris). It will grow large and it will have a nice set of choppers It likes to chomp on pieces of coral so it's not a good reef tank fish. It's also can get agressive when it comes to feeding time so it's not suitable for all types of tankmates.
That being said, there is also a yellow/ golden phase of this fish which is really a great looking fish and hard to resist (I believe this is the male in breeding color while the blue is the female. At least that's what I was told by my Costa Rican supplier.) $80 sounds like a good price depending on where you're at
Just a thought, Next time someone wants to get a fish for your tank, if they or you don't know much about the fish, have them get you a gift certificate instead. It's a much safer thing to do and less of a hassle than if they get you somethng that you can't or shouldn't have in there. (Take that from a former pet store manager )