I can see what you're trying to do, feeding from the bottom up, it does work.
imo it's best to cover those containers holding water, will increase humidity and scum will build up from the light/heat. correx is cheap enough and can be cut to size.
Regarding time and location. Yes best to leave it in the tent as you have at the moment. Not too sure on time but measure it over 24 hours, make some markings on the container or measure with scales.
Good luck!