I do add and switch different plants in tanks.Mine loves it when I move stuff around, because the flow is low even the floating plants and Betta log stay in one place, so once a week I move the surface bits around, when I do he goes into patrolling and building another bubble nest, it gets mixed up again for water change at the end of the week. Now he builds the most incredible bubble nest overnight in the fear it might not be there long.... sometimes I feel mean but it really keeps him busy and happy.
when I’ve changed decor around or swapped something I always thought it would stress him out but if anything he gets very curious and has a nosy about when I’m done, I can tell it excites him.
maybe have a few decorations so you could swap one over once a month or something.