I really don't think its over ferting.. it doesn't look like fert burn to me.. it looks like some kinda deficiency.. and i buitl it up i used 1/4 recommended dose in first go.. 2nd go i used 1/2 recommended dose then stuck at 1/2 for a while... in all of the 3 weeks i probably watered it 3 - 4 times with ferts in of weak strengths.. so i dunno.. any other ideas??