Helloo, and welcome to AQ. I will remind you to monitor the bookshelf, sturdy or not, A 3 ft fish tank is no joke, if you want to have rocks in it, then i will suggest not to. Becareful when doing water change, as water seeps down the glass will eventually take its toll on the bookshelf.
there are various ways to create depth,
1) create a slope, a low front and gradually increasing to the back of the tank.
2) use of small plants also gives a depth and space illusion
3) use of black background
Hope it helps!
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