Cichlid7,I reacon it is a good idea to have polystyrene for ALL around the tank.
It conserves heat to start with, so cutting down on the power bill, and also as you suggest, cuts down on ppl related stress.
If you were to consider the area where the fish breed in the wild, you'll come to the conclusion very quickly that they don't have great glaring lights on them all day and a whole heap of movement around.
Depends on if you are setting this tank up for breeding or for your viewing enjoyment as to how well you cover in your tank and the lighting.
My Uarus have all sides covered when visitors are here, all covered including the top at night,
and only two 2' flouros ,but with a lot of top cover floating indian fern.
I do remember visiting a chinese gentleman who had his tanks (lots of them) in an under-house garage with no lights.
To view them he gave us a torch.
Also the water changes are critical for top offspring with some of the older breeders that I knew in Auck. doing 50% EACH day.
They were dedicated, and admired by Jack Wattley when he came out to see them.
Taking back with him on the return flight, Heckels from Don Handley; he said he considered them the best he had EVER seen, miles to cheap, and in fact to take them back, he left his clothes behind.
You know what I mean so no smart a**** retorts to that