Maybe some red plastic shapes for the tank? I learned to figure it is their tank. As long as it doesn't keep the fish awake, I'm up for whatever they like.
Question about the little nano? Is there any problem with heat or some way for it to escape at the top? On the DOOD's, I was wondering how having the ballast outside the canopy might work? I stripped one out of a light and hung it on the back to get better airflow. May be no problem anyway but it might help in the future? Seems like the ballast was the hottest part.