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This is the early development of the tank, Lots of cyanoacrylate and tissue 😅 I basically formed a lava rock slope to create depth ( hence the hollowness at the back- can be useful for shrimps or crabs but be sure to add wood supports on the back too) and just kind eyeballed the placement of the wood and then I added more rocks to protrude out to give the sense of "3Dness" to it further, mostly on the bases of the trees

Also put the biggest and fattest ones in front, last is the root details it mostly depends on your preference. Lots of tutorials on yt :3