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My plants are on a drip feed under t8s with g8 nutes and I had the ph at 6.2 and read that this is slightly high of a ph so it's at 5.8 now. I have some reddish stems and a few spotted leaves Just wondering if this would cause the issues. It's only on 2 of my plants the temp is at 73 deg and...

So my plants are about 3 wks old and I've been feeding them gh with drip system once every hour they are under 4 t8 cool whites and I've been noticing on 2 of them that there is slight reddish purpleish fan leaf stems and spots on the lower leaves. I'm just trying to figure it out before its too...