Suggestions for 35th Anniversary gifts

So, in December, my parents will be celebrating their 35th wedding anniversary. Apparently, this is a big deal (or so my mom keeps expressinv), so I feel the need to do something nice. Help from my sister is most likely a big gaping hole of resources, so I’ll probably be stuck doing something with my broke ass. So, big trips are pretty much out of the question. Anyone got a suggestion for a nice, big, but hopefully not too debt inducing gift one can get for their parents on this big, special day?

Coral and jade are the official 35th anniversary materials. Maybe an aquarium?

That’s a very interesting idea…they did just get a beta. Thanks Zeldar. Anyone else got any ideas?