Hey guys, this is my first res change after a week my first. 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.