D.I.Y Decorating Fish Tank?

I own two goldfish.
the tank they live in has some little shells and 2 fake plants.
I am wondering, how can i decorate it ?
The fish dont seem to enjoy the fake plants and i was wondering what else coulld i do to make the tank look nice aswell as keep my fish happy.

I do not want to spend any money, i am looking for D I Y Ideas
thanks.
 
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