The nice thing about the Top Feeder is that it drains down the roots giving added nutrients. I could use the Top Feed pretty much all the way through. The research is that it's not really needed or diminishes it's usefulness as the roots grow into the oxygenated water. The DIY is really two Hydro systems; DWC and Top Feed. Can't see where it will hurt if the Top Feed is left on and off at intervals through the light ON during most of the grow. Plus I really shouldn't worry about the reservoir water level as much since the Top Feed will also give the girls the nutrients and oxygen needed.
Didn't think of that. Can't hurt at all to get a little more food to roots.
Looks like someone did their homework [emoji851]