1000ppm isn't too strong IMO....not for a plant that size....especially if you've been gradually increasing ppms with growth.... If the plant doesn't react negatively, give it 1k ppms for a week and increase to 1100 the next.... Flush thoroughly if negative affects appear.... If none appear, gradually increase.... 1800ppm is the highest I've run before running into negative affects....but that's just me....

Just my :twocents:....

CGI::::::