So how much rock do you have there in lb., and what size tank? While I like it, I also agree that if you are going to have fish, they really do not have shelter. While I like the minimalist aquascape visually, I think it is hard to combine that with fish caves and territories. For instance I have 4 fish and a shrimp currently in a 75g, and each fish has a cave they sleep in. I am planning to add one more fish soon, but before I do so, I need to create at least two more caves, as I really do not have any available shelter spots. With at least 2 new spots if a current tenant gets evicted, at least they will be able to find shelter, and hopefully the newbie will choose one of the new spots off the bat.