No matter how hard you try you will always have those dead spots what you want to try to do is minimize those dead spots which is why you try to keep rocks off the glass and as soon as you add said rocks you will have more said dead spots but then that is where your CuC and bottom feeding fish come in the small dead areas will be taken care of. It's when those dead spots become big dead spots is where you have issues.
While your tank is cycling with the rock and sand this is when you want to move things around to find best placement before you place your CuC/fish. It's the small things that drives a person nuts in this hobby. Fortunately you have a small tank so it's not much of a concern per se it's when you start getting into the larger tanks that this becomes more of an issue
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 My aquarium is nothing but a smorgasbord for my cats.....
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