Any one got any suggestions?
I have given them a quarter strength biobizz grow solution, with ph6 and no signs of burn yet.

The ph may be high in previous post as brita filter was on last legs, and when i originally tested filtered water, a newish filter gives 5.9-6ph, and a filter on last legs (a month old) gives 7ph.
New filter installed.

I have concerns as a friend is doing the same as me, same nutes and soil (we sharing), his own envirolight, and has also experienced early burn and slow growth.

Any one used this bio terra professional with any luck, as we suspect that may be the prob.