Yea, that's the same on my 2. Is it normal? They don't seem in any discomfort or ill.
Ps. Very nice pic and fish, mine are only 5inch as yet but can notice the growth since purchased
one more thing (a word of warning)i had a blue lobster in with my oscar which was about 7" it moulted and i found it dead the next morning with a soft shell and no legs
There is plenty of hiding places were the oscars can't get too. Hopefully she'll be fine, its actually the oscars I'm worried bout, the lobsters has nipped the a few times