As you can see by the quote, there is no electrical inside the tank. So he's actually installing it exactly as a pool or hot tub. I won't bring up the light-distance from water thing, because I don't know how close they are. But the tank is going to be covered by plastic (as he stated), so they would have to bust through the plastic to get into the tank...
I'm not trying to support either side of the argument, just pointing out what was stated.
Anyways, awesome build, can't wait to see the tank get coated and water in it! I'm living vicariously through you since my fiance would NOT be down with me doing this to our extra bedroom (I asked
).