Alright, this is semi-off topic.

My dad is trying his hand at gardening and has tasked me with researching the care of seedlings/germinating plants.

He is most worried about drowning the newly planted seeds. We're growing a variety of vegetables, but the fastest germinating seeds so far are green beans. We have them in a seedling tray, which is basically a basin with the tray fitting inside said basin. We've got about a half inch of standing water in the basin, which can freely flow into the mini pots, which are filled with potting soil/one seed. If that makes sense. I was thinking that a false bottom like we use in our vivs could be of use, but I'm not at all experienced with gardening so any and all advice/tips/tricks would be greatly appreciated. Sorry for this being slightly off topic, but I figured this was one of my better resources for this type of info, thanks in advance!