i always enjoy tanks with shoals of lookdowns. now he just needs one that will keep 20. problem with most shoaling fish is unless you keep a predator they wont stay shoaled as its a natural defense mechanism when predators are near.
My next tank in my new house i think will be approx 5k gallons and be 2 large dead acro table heads with clusters of green chromis darting over them and a black tip swimming over them with a nice sand bad for effect. i think for asthetics it doesnt get any better than that for an aggressive tank.
but never the less thats a nice tank. i normally dont liek the whole fake coral look but that one isnt gaudy. its a nice tank.