so you did not have the water pump and feeder tubes to the cups?
Tank should be filled about 1 1/2" below the bottom of the net pot. If it's dark put the top of your hand under the bottom of the net pot and when your wrist gets wet it's full! Don't really understand why you would not have enough light to see but let's just say sometimes late at night I check things and figure out how to do things in the dark of lights out! LOL!
Thou duth worry too much! LOL! Been there, done that!
On the prop-up - S hook tied to a string tied to a hanger or any solid point! How that for a little creative engineering! LOL!