once it starts to flower keep the light on it for 24 hrs for about 2 weeks then switch the light to 12hrs of daylight and 12 hrs of darkness.
All plants need some dark time. The maximum time a grow light should be left on is 18 hours.
If you leave them long enough they will grow to larger sphere's the underground man should explain that.
Just leave it on overnight
Provided the light is strong enough and is on for long enough Duckweed should grow well in artificial light. I do hope you are not calling a small tank a 'Pond'. A Koi Carp grows to over 24 inches long and so it should really be in a real outdoors pond type situation. That is what they were bred and developed for.
There is no minimum or maximum for how long you can let something grow. You can leave it in the incubator for as long as it is alive and continues reproducing.
As long as the roots are in the ground the plant will grow towards the light.
12 hours of light 12 hours of dark
Depends how long you leave it on for....
anytime as long as you ave water and light
A light bulb is dangerous because if leave it on too long it will burn.
Until they grow up and leave home :(
To stop putting mascara on them and, leave them alone and let them grow.
30 minutes to an hour.