hmm dont think its over feeedin as i always gave less than it said on the guide i have ..
also it wasnt 20 ml biobizz on 1.5 l it was 20ml per 5 liters /so 4ml/l .
each plant takes about 1,5 liters every 3 days or so ( i let them get pretty dry)
anyways it hasnt got any worse ,since i posted so im happy

thnx for the help :rasta: