SO WITH MY SETUP SHOULD I LEAVE THE SCREEN ON to intentionally diffuse some of the light? Is there such a thing as RES getting too much uvb by being too close?
I am trying to picture the set up that allows basking 4" from the bulb - is the water level high? It is best to keep the UVB at the recommended distance. If its too close, it can hurt or irritate their eyes (puffy, or dry, or combo of the two). Obviously, some turtle are more sensitive than others. I don't see the need to cut the mesh on the hood, the UVB won't be affected significantly through mesh - it's plastic, glass or water makes them short of useless.
Your safest route is probably to get a cheapish basking thermometer and adjust the lighting (UVB and heat) until the basking areas is 10-15 degrees warmer than the water. I think you will find that 6-10 inches will do the trick if you are using a UVB tube light.
My question IS THERE ANY REASON I COULDN'T OR SHOULDN'T ADD STANDARD BIOMEDIA in that location of the 40i in place of or in addtion to the plastic-tined insert?
They sell Biomedia bags for the 40i - it is really just carbon and floss. I see no reason why you couldn't add some media in the open area, as long as it is contained (i.e., the Bio bag, or carbon in a nylon stocking or something). I would keep the divider that came with it. The ceramic bio media is white bulky, so maybe hold off on that until you have a larger filter.
IS THERE ANY REASON I SHOULDN'T PUT BAMBOO in with the RES
I think the jury is still out on whether it is unsafe for them to eat bamboo. What we see as decor, they see as food.
If in doubt, you can buy fake bamboo - that's what I use. It doesn't get waterlogged and she hides in it.
My question is CAN RES HANDLE ARIZONA HEAT IN SUMMER IF THEY HAVE PLENTY OF SHADE
Sorry - I can't answer that one.
A lot of ambiguous answers, I know. But there never seems to be a cut-and-dry answer for anything. Each little guy or gal seem to have their own quirks.