should be fine... oscars can hold their own and are tough fish for alot of certain water changing parameters.
I'd say go for it! - If anything, just take it out.
I put some animal bones (cow) that were dried and aged in my yard in my AC tank. Within 6 months they began to break down and be eaten by everything in the tank.
And yes, my PH was raised by almost a whole percent.
they are fairly fresh last years shed they wernt off a buck i shot so they have had time to age alil but i mite age them in the full sun over the summer to maximize the quality. thanx for the info guys