Oh no problem this is a great forum full of great people I am no means a expert myself but working on it here is a pic of my nano same size and dimensions of yours by the looks of it
Something I learned was the least amount of rock covering the surface of your sand the better because this creates a more open flow for water to travel through and less deadspots (no water flow at all) Before I tried this attempt I often noticed a few spots that had diatoms on the sand surface but after a little re-arrangement those spots are now non-existent.
Did you say if you had your clean up crew yet?