Well flushing is the right way to go. At 3 weeks old your plants were not ready for full strength nutes. Go half nutes or a little less than half when you add the nutes.

PH is a daily thing. Keep on it at the same time each day it will level out and not change as much. Good idea to change from tap water to R/O, it may have been what was burning them up.

As far as the PPM's. The only way they will change is if your plants are drinking alot of water and I don't think those little ones are doing that.

If your water was low and you added more tap water then it would go up by how much ppm's the tap water has.

If your plants drink alot in a day then PPM's go way up. You add just PH'ed R/O water and ppm's come bcak down to where you had them. Do not add water with nutes only plain water.
LOC NAR on probation Reviewed by LOC NAR on probation on . please help. new flood table set up OK, I am totaly new to hydroponics. I have a ton of money invested here and need help getting this set up right for he plants i have going now are just bag seed for trial run. I started out from seed, used 2x2 inch rockwool cubes to start. Then put them in a home made DWC set up. Used a 600 watt HPS light at first but have since switched to a 600 watt MH conversion buld. Its a solarmax brand bulb. I have switched from the DWC to a 3x3 foot flood table set up i purchased from the local hydro Rating: 5