The rubbermaid tubs would be fine. On top of the powerhead for circulation, you may want to have a heater aswell. Just to make sure the temp doesn't drop to much. As for light...if there is anything growing on the rocks, they need light, not tons, but it will need some. Just stay on top of the evaporation on you should be fine. And as far as I know, nope, you don't need to be skimming it. It will be fine with the powerhead. IMO 