im using botanicare pure blend pro grow and liquid karma and was wondering when i start first feeding should i mix both or just start of with one of them and if so which one and the plant is about 2 weeks 2 days fed it couple days ago cause tips started turning light green but it burnt them a little.i mixed both of them at 1/4 strenght so im thinking it was to soon any advice?oh and its in perlite and vermiculiye mix.