U GOTTA FLUSH!!then grab a ppm & a ph meter and after flushing refill ur res,check ur ppm levels in ur water,then add nutes but start at half the rate of whats on the back of the bottle.then go from there with ur ppm.tap waters starts off around 300 to 500+ and u want a reading around 1400 to 1500 maybe 1600.1600 would be a little high for u now.i think.u have to work ur way up tho first weeks of flower u want a level aroun 1000 to 1200 then take it up a 100ppm's a weektill u get up around 15 or 1600.some nutes say to start at 13-1400.and u gotta know ur ph levels to.u want 5.5-6.5.hope some of this helps