I don't know what a rubbermaid tub is, but I use a dark (mostly black) round tub about 10-13.5g. I fill the water half or 1/3 and use a lot of anacharis in half of the tub. I don't use cups or any nest area. I simply cover the top where I want the nest to be (usually with wood). I could see everything.
This is not my breeding set up. But this is the tub I use and the white square is how I cover (sometimes I cover half of the tub)
If you don't use cups for nest areas, you can see the eggs. Further the female will usually be at the opposite side of the tub.
You can reduce the plants or spread them evenly through out the tub once spawning is complete. You can see fry, gunk, etc. And once you're used to it, you can tell if the fry are having problems. But you can't see the fry eating, nor can you take pictures of them.
Deeper tubs like this 21g icebox is harder to control. You cant see much other than if the spawning is done. I usually don't siphon gunk out when using this tub. And I control my fry at night - when fry usually rest on the surface.