Hey guys, this is my first res change after a week. I have 6 liters (1.6 gal) of water in my res and after about 6 hours after the res change this morning, the ppm has dropped and so did the water level. Does this mean I fill the water back to its original level and not add anymore nutes till tomorrow or something OR should I just leave it alone and tomorrow just fill it back up with nutes to get to the ppm I was at earlier? OR do I just top it off with plain water? Also the PH also went up a bit.
Study this thread. Your ppms went down and pH went up because the plant is eating and could likely use a slightly higher strength. I would mix up about a gallon of nutes at a ppm 20-50 parts higher than the last time. pHed at 5.8. Top off with that, and then re-check/adjust pH to ~ 5.8 - 6.0. Check again in 24hrs. Adjust accordingly.