I think taking the jaguar back is a good & sensible move.ill take back the jag tomorrow and swap for a severum
A severum would be better as the water parameters required are similar to that of the oscar.
Black Ghost made some good points and is a knowledgeable member.
Sometimes we put things over that are taken not quite as intended, I'm the same at times.
At the end of the day the advise given is with the welfare of the fish and the continued enjoyment of fish keeping in mind.
No one wants to see a stressed fish or a stressed fish keeper.
I wish I had a second big aquarium where I could keep oscars and/or severums, I really like both fish.
I saw a big aquarium at an LFS whilst on my travels about 2 years ago, the aquarium must of been around 1000L+ and had several large fish species which included oscars and severums.
The severums were around 6 inches whilst the oscars were a little bigger at around 8 inches, beautiful fish with lovely colouration and markings. I could only admire the aquarium.
All the best
Stay safe & healthy everyone