I think the fish oil is a great addition.
After many years of watching my grandparents struggle with the typical aches and pains, I suggested fish oil and they've been consistently feeling better ever since.
The only problem I've encountered is actually getting my Grandmother to take it, or any pills for that matter. She's a stubborn one!
But, yeah, I think it'd be a good choice.
I can't really think of any problems with the grean tea either, but, it might be best to just start with one and take it from there.
Hope this helps!