Good morning, this is my first grow. I am growing Gelato autoflower, 4x4 tent, TSW 2000 LED light, using Fox Farm soil and nutrients and am currently in week 4. I have been doing some LST to try to even out the canopy, and I think they are about to start flowering pretty soon, and want to be sure they are supported well. Should I use the trellis net or tomato cages with clips? Just wondering what works best for other growers.
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Your girls are looking happy and healthy so I wouldn't go with a flush just yet. A plain watering occasionally is a good idea, I usually do two feedings and then one feed of just PH'd water. So probably a good idea to give them just plain PHd water for the next feed or two.
As long as what you are feeding is in the correct PPM range and you throw in a plain PHd watering every couple of feeds, I wouldn't worry too much about the run off PPM unless your girls are having issues.
In case you have not seen this, here's a good PPM chart.