yeah I just saw it now I didn't know you mixed your own soil which is good lots should do this, but you need to add dolomite lime to get Ph soil higher, tree bark is to lower your Ph you need to raise it. when mixing your own soil most just us worm castings perlite and dolomite lime, you left the dolomite out so now the Ph is not set correctly I think if you add some dolomite to the surface you should be OK, but do the Ph test and make sure. dolomite is avalable at any hydro stor or nursary sometimes even wallmart