The lime build-up I was referring to was from your water source. Hard water has a lot of lime in it, so if you spilled some water and let it evaporate, you'd see this white residue left behind. I'm no water expert, but with a starting ph of 8.0, it could be all the lime making it that high, or then something else. Anyways I don't think you'll have a problem, I had white residue on my soil before (from hard water).
bigtopsfinn Reviewed by bigtopsfinn on . first grow-Nirvana Snow White- soil im new to growing anything.... let alone cannabis...lol but so far its been so much fun i think i found my new hobby:thumbsup: anyways right now my plants just started their 4th week since popping soil. Seeds are Fem. Nirvana Snow white. Germed in and still in Fafards starter mix. will be transplanting soon into a mix of peat moss, vermiculite, perlite and lime. they are pretty small for their age...right around 4 inches. i was using 4 26w CFLs(for 5 plants) up until yesterday.... then Rating: 5